MARINE FAUNA AND FLORA OF SOUTH DEVON AND CORNWALL. 53 



Of the last species we have some doubt, as Mr. Bell remarks, it is ex- 

 tremely like the young of P. bernliardus, and certainly until we can capture 

 a specimen bearing ova we are much inclined to believe that it is so. 



We are glad to be able to record P. dillwynii from the south coast 

 of Devon. It is now about fifteen years since the first and only specimen 

 was taken on the coast of South Wales. ~No other naturalist appears to have 

 fallen in with it, and we found it necessary to take an occasional look at the 

 original specimen to assure ourselves that we had not committed a mistake 

 in considering it to be distinct. 



A few weeks since, seeing a woman shrimping on the sandy beach at 

 Teignmouth, we requested to have a look into her net, and among the com- 

 mon shrimp we saw to our great pleasure numerous specimens of P. dillwynii ; 

 after purchasing her entire stock we hastened to the beach, and with the in- 

 coming tide took numerous specimens which we kept alive for a short time. 

 This, the prettiest of all the pretty genus, has the habit of burrowing in the 

 sand, and it is probably to this circumstance that it has not been met with 

 before ; but, curious enough, we have since taken it with the dredge in about 

 four fathoms of water in Bigberry Bay, and again one specimen in six fathoms 

 as near to Plymouth as the mouth of the river Yealme. 



An interesting point in the history of this genus we have been enabled to 

 make out relative to the development of the young. The end of April or 

 the beginning of May is the period when the young appear to be most abun- 

 dant. Early in June we were enabled to capture many specimens of the 

 young animal in various degrees of progressive development, a circumstance 

 that has enabled us to determine that the species Glaucothoe peronii, described 

 by Prof. Milne-Edwards in the Annales des Sc. Nat. for March 1830, is none 

 other than an immature stage of the genus. At this period the little crea- 

 ture swims freely in the ocean, until obliged by increasing age to take refuge 

 in a shell, when he settles down and becomes a hermit crab. 



Of the genus Palinurus we would desire to point out a curious and in- 

 teresting structural condition of the inferior antennas. In all macrourous 

 decapods the inferior pair of antennas is furnished with a lateral scale, or ar- 

 ticulated process. This is invariably situated at the extremity of the third 

 joint of the peduncle ; now in Palinurus this scale or squamiferous process 

 is incorporated with the walls of the peduncle, the third and fourth joints 

 being fixed together, and the squamiferous process exists in form only as a 

 figure impressed against the sides of the antennae. 



In the elaborate memoir of Prof. Kinahan on the genus Crangon, we think 

 that he has erroneously figured the common shrimp, or that the common 

 shrimp of the Irish, differs from those of the English, shores. The small and 

 delicate second pair of pereiopoda that Mr. Bell describes as being " nearly as 

 large as the third," and figures rather shorter than the first, Dr. Kinahan 

 makes as long again as the first pair. Prof. Kinahan's figure is also more 

 slender than that of our edible shrimp ; neither can we see the desirability or 

 convenience of the generic separation which he has made between those hav- 

 ing the second pair of pereiopoda short from those that have them a little 

 longer. This being only variation in degree, and not structurally important, 

 we consider as being only of specific and not generic value. 



Among the prawns we are enabled to add a new genus to the British 

 fauna, namely, Caradina of Prof. Milne-Edwards. In making this interest- 

 ing addition, we must remark that it is one of name only, since it is, we be- 

 lieve, the same that Dr. Leach described under the name of HippoTyte va- 

 rious, which has remained so long misinterpreted. We have occasionally 



