Decapoda- Macnira, Anoinura. 



59 



The existing species arc contincd to the deep sea, and, like Table-case 

 many other deep sea animals, arc Mind. Some, at least, arc ■^°- ^^• 

 phosphorescent, and a living example of Pohichvlcs jiJiosplt.oriis (o[ 

 which a specimen is exhibited) (Fig. 38) was ohsei-ved hy Di'. Alcoek 

 to be " luminous at two points 

 between the last pair oF thoracic 

 legs where there is a triangular 

 glandular patch." A copy of a 

 drawing made from a living sp(?ci- 

 men of another species, Pubjcltclcs 

 ■sculptus, dredged at a depth of 695 

 fathoms in the Gulf of Panama, 

 shows the red coloration that is very 

 characteristic of deep-sea Crustacea. 



The fossil species are represented 

 by a cast of Enjon arctiformis, from 

 the Lithographic limestone (Jurassic) 

 of Solenhofen in Bavaria. 



The members of the tribe Tha- 

 LASSiNiDEA are burrowing forms, 

 with a soft, loosely built body. They 

 form, in some respects, a transition 

 to the Anomura, in which, in some 

 systems of classification, they are 

 included. 



In the genus Calliaitas>ia, of 

 which one species, C. suhtcrranca, 

 occurs on the south coast of England, 

 one of the chelae of the first pair of 

 legs is much larger than the other 

 and is of peciiliar form. A specimen 

 of the large C. armata from the 

 Fiji Islands is exhibited. 



Thalasshia anomala is a widely 

 distributed tropical species, especially 

 characteristic of mangrove swamps, 

 but sometimes found burrowing in 

 able distance from the sea. 



Polychclcs phosjilioriis, female. 



(After Alcoek.) [Table-case 



No. ll.J 



damp earth at a consider- 



Sub-Okder 2.— anomura. 



The Anomura commonly have the abdomen more or less bent Table-case 

 under the Iwdy, or else spirally coiled and asymmetrical. The * "• "• 



