TO INDIAN CARCLNOLOGY. 121 



Genus Troglopagurus, n. 



The front is scarcely produced in the middle. The eyes are moderately slender, the 

 ophthalmic scales narrow, triangular, and closely approximated. The antennal acicle is 

 short and robust ; the antennal flagellum rather short, and fringed with long hairs. 

 The chelipedes are shorter than the ambulatory legs, and the left is larger ; the fingers 

 are almost vertical, and their apices are calcareous. The ambulatory legs are slender, 

 and similar on the two sides. 



The species described below inhabits small holes in coral. The genus comes nearest 

 to Pagurus, in which, however, the chelipedes are longer, and the fingers have corneous 

 apices, the antennal flagellum is long and not ciliated, the ophthalmic scales are broader, 

 and separated by a wide interval which is occupied by a calcified nodule or sclerite ; the 

 ambulatory legs are usually dissimilar on the two sides, and the species are of much 

 larger size. In some respects it resembles Pagnristes, but in this genus the chelipedes 

 are subequal, and the first, or first and second abdominal segments, carry genital 

 appendages. Gryllopagunis, Zietz (Trans. Roy. Soc. S. Austral, vol. x. 1888), which 

 inhabits cavities in loose stones, has the ophthalmic segment exposed, and provided with 

 a mobile scale (presumably as in Diogenes), and its structure is otherwise very different. 



222. Troglopagurus manaarensis, n. sp. (PI. XXXIX. figs. 9-11.) 



Tuticorin and Muttuwartu Par (Thurston). 



The carapace is well calcified anteriorly, and somewhat rugose, with a rather deep 

 semicircular impressed line a short distance behind the front. The median projection of 

 the front is obtuse, and but slightly produced. The ophthalmic scales are narrow and 

 triangular, with about six spinules on the outer margin, of which the apical one is 

 largest. The eye-stalks are slender, reaching the middle of the last antennal peduncular 

 joint. The antennular peduncles are slightly larger than the antennal peduncles. The 

 antennal acicle is short and broad, scarcely extending beyond the commencement of the 

 penultimate peduncular joint, with about five small spinules on its inner or subterminal 

 margin ; the antennal flagellum is about twice the length of the peduncle, and fringed 

 inferiorly with very long hairs. 



The left or larger chelipede has the carpus, hand, and fingers spinose and pubescent 

 above. On the carpus the spines are almost confined to the inner margin and the 

 upper anterior margin ; on the hand they occur chiefly along the inner margin, extend- 

 ing on to the border of the dactylus, while on the upper surface and outer margin, 

 especially towards the immobile finger, some smaller ones are seen. The fingers are 

 finely and irregularly toothed, with their inner margins practically in contact when 

 closed. The right chelipede reaches as far as the commencement of the dactylus of the 

 left chelipede ; it is strongly pubescent, but has fewer spines than the left. The ambu- 

 latory legs are slender, and similar on the two sides, with the joints moderately pubescent, 

 but otherwise smooth ; the dactyli have horny tips, and are almost as long as the 

 propodi. The margin of the telson is finely dentate. The abdomen and its appendages 

 are similar to those of a Pagurus. 



SECOND SERIES. — ZOOLOGY, VOL. V. 00 



