CRUSTACEA. 



Ill 



complexly* chelate ; posterior of tail appendages unibranchod. 

 Telson rudimentary. 



The animals of this genus construct tubes in which they dwell. 

 Cerapus abditus. — Templeton, Trans. Ent. Soc., I, p. 188, pi. 

 xx, fig. 3. — Bate and West-wood, I.e., p. 456. 



Templeton took the specimens, from which he described the 

 species between the southern and northern hemispheres. Dana 

 has described a crustacean from the coast of Brazil under the name 

 of Pyctilus brasiliensis, which nearly resembles this British 

 species, which offers among other facts, evidence of the approxi- 

 mation of forms between British and South American Crustacea. 



It has been taken in Plymouth Sound. According to Mr. 

 Templeton, it lives in a long narrow membranous tube. 

 Cerapus, Fern. — Gtenus, Dercothoe. — Dana, U.S. Expl. Exp., 

 p. 968. — Bate and Westivood, p. 459. 



These are females of the last genus, but differ so considerably 

 in form, that they were described as a separate genus by Dana, 

 and the name is retained in Bate and Westwood's " Sessile-Eyed 

 Crustacea" as a temporary convenience for the females until the 

 males have been determined. But we have little doubt but that 

 Dercothoe punctatus is the female of Cerapus abditus. 



The second hand is smaller, and the carpus only projects as a 

 scale below the hand. 



Genus, Njenta. — Spence Bate. 

 Cat. Ampli. B. M., p 271. — Bate and Westivood, p. 471. 

 Antennae subequal; no second branch. Hands subchelate, 

 posterior pair of caudal appendages two branched. Telson 

 cylindrical. 



Njsnia tuberculosa. — Spence Bate, Cat. Ampli. B. M., p. 271, 

 pi. xlvi,fig. 2. — Bate and Westivood, p. 472. 

 We have taken this species not unfrequently in the dredge 

 off Plymouth, and we have received it from Banff, from Mr. 

 Edward. 



A closely allied species of this genus is known to inhabit a 

 whelk shell, together with a soldier crab and annelid, in the 

 peaceful character of a li Happy family." 



* Complexly chelate means, when the claw is formed by more than two 

 joints. 



