TO INDIAN CARCINOLOGY. 437 



Genus Angasia, Bate. 



Angasia, Bate, Proc. Zool. Soc. p. 498 (1863). 



Tozeurna, Stimpson, Proc. Acad. Nat. Sci. Philad. p. 26, Jan. 1860. 



I propose to substitute this generic name for the older Tozeurna, Stimpson, which, in 

 its correctly spelt form Toxeuma, had been preyiously applied by Walker to a genus of 

 Hymenoptera. Stimpson gives the derivation ' his name, so that the spelling has 

 perhaps been due to a printer's error which he has allowed to pass. 



256. Angasia Stimpsonii, n. sp. (PI. XL. figs. 18-20.) 



Gulf of Martaban, two specimens (Oates). 



The body is compressed laterally, with the rostrum about equal in length to the 

 abdomen, omitting the telson. The rostrum is slightly upturned, with an obtuse or 

 rounded dorsal carina, bounded on either side by a slight groove, but thin or laminar, 

 and finely serrated, below ; seen from the side it is deepest immediately in front of the 

 eyes, from which point it gradually tapers to the apex. The carapace is provided with 

 an acute anterolateral spine. The eyes occupy orbits, which are formed partly by the 

 rostrum, and partly by the antennal peduncles. The antennular peduncles are not half 

 the length of the antennal scales, and their flagella, which otherwise agree with Stimp- 

 son's description of those in A. lanceolata, reach only to about the middle of the scale ; 

 the basal peduncular segment has an external flattened acute process. The antennal 

 peduncle has an acute spine on the under surface of its basal joint, about equal in size 

 to the antero-lateral spine of the carapace ; the flagellum extends considerably beyond 

 the rostrum, although incomplete in both specimens. The antennal scale is very long 

 and narrow, being almost half the length of the rostrum. 



The abdominal segments are obtusely carinated, and the third, fourth, and fifth are 

 each prolonged posteriorly into a dorsal tooth. The telson is very long, narrow, and 

 acuminate, slightly exceeding the last appendages, and with three pairs of lateral spinules. 

 The legs are as described by Stimpson in A. lanceolata, the wrist of the second pair 

 being three-jointed. 



The larger specimen, a female with ova, is imperfect, but the smaller gives the follow- 

 ing measurements : — length of body, measured from the eye to the tip of the telson, 

 43 mm., rostrum 22 mm., antennal scale 9"7 mm. long and T2 mm. in greatest breadth, 

 telson 93 mm. long. 



In some respects this species seems to agree with A. lanceolata (Stm.) from Hong 

 Kong, but Stimpson, in his short description of the latter, states that the rostrum is 

 " scarcely a fourth part shorter than the body," and that the antennuke equal in length 

 the antennal appendices or scales ; he also describes the antennae as shorter than the 

 rostrum, the antennal scales as one third the length of the rostrum, and the breadth of 

 each scale as being equal to one fourth of its length. Our species may therefore be 

 distinguished at once by its very much longer and narrower antennal scale. A.pavonina, 

 Bate, from South Australia, has the rostrum with only four teeth below, the antennal 

 scale reaching nearly to the end of the rostrum, and the apex of the telson obtuse. 

 The only other species known, so far as I am aware, is A. carolinensis (Kingsley), from 



SECOND SERIES — ZOOLOGY, VOL. V. °2 



