Description of Female

Colour in formalin white; eyes orange, covering head and noticeably rounded. Length, 5 mm.; depth, 1¼ mm.; width, 1½ mm.

Antennae. First: Length, 1 mm. Flagellum of 3 segments, last 2 minute with setae on end margins; 1st large, tapering, length nearly twice peduncle, 3 times proximal width; inferior margin sparsely fringed with paired long flaccid sensory setae. Second: Arising inferiorly, as is usual in Cyllopus, and well back. Of 6 segments, 4th the longest, segments comparatively strong, length not more than twice their width.

Mouthparts. First Maxillae: Outer plate distally narrowing to point, distally setose, reaching ½ along inner plate teeth; inner plate noticeably square, with several strong distal teeth, distally setose also. Second maxillae: Simple distally emarginate structure, each of indistinct apical lobes setose. Mandibles: Cutting edge a single lightly-incised plate; spine row of numerous very short setae, extending to strongly produced molar process which has incised marginal rim. Palp strong, 2nd segment 3 to 4 times length 1st; 3rd narrower, distally pointed and with a few bristles, nearly as long as 2nd. Maxilliped: Like C. magellanicus but outer plate inner margin less incised; outer margin has only about 2 setae, is more slender and somewhat more acute distally.

Gnathopods. First: Like C. magellanicus but basos between 4 and 5 times ischium length; merus with strong spine near posterodistal angle, length ⅓ basos; anterior carpus margin ⅖ basos; propod slightly shorter, width about ⅔ length; dactylos ⅔ propod length; anterior propod margin smooth. Second: Ischium ⅕ basos length, spine at posterodistal angle; merus distally produced ½ along carpus; total merus length about ⅓ basos length; posterior merus margin has 2 strong spines, process has 4 marginal spines. Carpus total length ⅔ basos, posterodistally produced about ¼ along propod and minutely toothed. Propod ¼ basos length, posterior surface minutely toothed; dactylos similar, more than ½ propod length.

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Peraeopods. First: Ischium ⅓ basos length; merus length twice width and ½ basos length; carpus width ¾ length, length 2/4 merus; propod posterior surface with a few scattered minute teeth, posterior margin as long as merus, length 3 times width; dactylos more than ½ propod length. Third: Basos expanded, margins convex, anterior has 4 small spines, posterior 3 or 4 minute setae; width ⅔ length. Ischium more than ⅓ basos length, single spine anterodistally. Merus ⅔ basos length, margins parallel, 1 or 2 small spines anteriorly. Carpus subrectangular, width ⅔ length, length ¾ basos, 2 spines anteriorly, end margin minutely toothed. Propod length nearly twice carpus, about 6 times own width, comb of fine teeth along anterior margin; dactylos ⅓ propod length. Fifth: