CRUSTACEA. 
Ill 
complexly^ chelate ; posterior of tail appendages unibranched. 
Telson rudimentary. 
The animals of this genus construct tubes in which they dwell. 
Ceeapus abditus. — Templeton, Trans. Ent. Soc., 1, p. 188, p?. 
XX, fig. 3. — Bate and West-wood, l.c.,p. 456. 
Templeton took the specimens, from which he described the 
species between the southern and northern hemispheres. Dana 
has described a crustacean fi'om the coast of Brazil under the name 
of Pgetilus hrasiliensis, 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 Plj^mouth Sound. According to Mr. 
Temidoton, it lives in a long narrow membranous tube. 
Ceeapus, Aim.— G exus, Deecothoe.— E.S. Expl. Exp., 
968. — Bate and Westwood, 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 
Bercotlibe punctatus is the female of Cerapus aiditus. 
The second hand is smaller, and the carpus only projects as a 
scale below the hand. 
Genus, Nasnia. — Spence Bate. 
Cat. Ampli. B. M.,p 271. — Bate and Westwood, jj. 471. 
Antennae subequal ; no second branch. Hands subchelate, 
posterior pair of caudal appendages two branched. Telson 
cylindrical. 
N^nia tubeeculosa. — Spence Bate, Cat. Arnph. B. 3f., p. 271, 
pi. xhi,fig. 2. — Bate and Westwood, 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 
^helk shell, together with a soldier crab and annelid, in the 
peaceful character of a “ Happy family.” 
* Complexly chelate means, when the claw is formed by more than two 
joints. 
