CALIGUS ZEI. 55 



rounded, slightly produced so that the posterior margin 

 between the rounded angles is more or less incurved. 

 Abdomen short and uni articulate. Caudal rami small. 



Antennules rather longer than usual, the second 

 joint being about five times longer than broad and 

 much longer than the first joint. Antennae sharply 

 hook-formed. First maxillipeds elongated and slender, 

 the second joint long and narrow, and furnished with 

 two tolerably long spiniform and claw-like setae, the 

 outer one being rather longer than the inner. The 

 second maxillipeds moderately large ; the basal joint 

 stout but the end one short and narrow, and armed 

 with a tolerably stout terminal claw. Sternal fork 

 small, with moderately long and slightly tapering 

 branches which are also somewhat divergent. The 

 fourth pair of thoracic legs moderately elongated ; 

 basal joint narrow and about as long as the two- 

 jointed ramus ; the joints of the ramus of nearly equal 

 length, the proximal joint provided with a stout spine 

 on the outer distal angle, but the end joint with four 

 spines, one near the middle of the outer margin, and 

 three at the apex, the middle one rather longer than 

 the one on either side. The fifth pair, which are very 

 small, situated near the postero-lateral corners of the 

 genital segment. Length about 5'5 mm. 



Male. — The genital segment in the male is as usual 

 considerably smaller than in the female ; it is narrow 

 and scarcely twice the width of the abdomen. The 

 abdomen, which is longer than in the female, is com- 

 posed of two segments, the first being rather shorter 

 than the second. The thoracic and other appendages 

 are somewhat similar to those of the female except 

 that the second maxillipeds are stronger. 



Habitat. — Taken forty years ago on the dory, 

 Zeus faber, at Polperro by Laughrin, and sent by 

 him to A. M. Norman.* Several specimens were 

 found attached to the skin of a Zeus faber captured off 



* ' Crustacea of Devon and Cornwall,' by the Rev. A. M. Norman and T. 

 Scott, p. 207 (1906). 



