462 COROPHIIDJS. 



half its length, and but slightly produced upon the 

 inferior margin ; together they form a long oval, having 

 the palm not denned ; the finger is finely crenulated 

 along the inner margin. The coxae are not deep except 

 in the fifth pair of legs, which, in the specimen from 

 which our figure is taken, are deeper than the preceding, 

 an unusual, and we believe an accidental or abnormal 

 occurrence. The thighs of the five pairs of walking 

 legs are broadly dilated, pear-shaped, the distal part 

 being the broadest. The caudal appendages have the 

 margins of the branches minutely serrated and armed 

 with a few small spines; the posterior pair are very 

 strong, unibranched, and tipped with two or three short, 

 hook-like spines. The middle tail-piece consists of two 

 lobes, each being armed with several rows of short sharp 

 teeth, one lobe being represented at the upper part of 

 figure v. 



This animal is of a yellow or straw colour, beautifully 

 marked with fine pigment cells, which appear to be most 

 abundant on the coxae and along the margins of the 

 segments of the body of the animal. 



We have placed this species in Dana's genus because 

 we have not had proof of its actual relationship to 

 Cerapus. We, however, have scarcely any doubt in 

 considering it as being the female of Cerapus abditus, 

 especially as Mr. Alder, who sent the specimen to us, 

 stated that it was the inhabitant of a tube, and as its 

 sex is indicated by the eggs seen in its egg-pouch. 



We received this specimen, from which our description 

 and figure are taken, from Mr. Alder, who dredged it 

 on the coast of Northumberland ; and we have a drawing 

 of a specimen that we took with a dredger some years 

 since in Oxwich Bay, on the coast of Glamorgan, which 

 we believe to be identical. 



