134 A. Alcock — Carcinological Fauna of India. [No. 2, 



bases ; the upper part of the stem with 3 or 4 scattered lanceolate 

 acuminate hracts "5 or "6 in. long. Spike 3 or 4 in. long, the bracts 

 lanceolate, equalling or longer than the sessile shortly beaked ovaries. 

 Sepals, petals and lip connivent. Dorsal sepal broadly elliptic, oblong ; 

 the laterals oblong ; all sub-acute. Petals shorter than the sepals, 

 broadly elliptic, sub-acute, the bases oblique. Lip equalling the sepals 

 in length, oblong, concave, 3-lobed, the margins entire ; side lobes nar- 

 rowly triangular, pointed forwards, very near the small triangular blunt 

 terminal lobe. Spur small, globular, slightly compressed vertically. 

 Column broad, with 2 unequal triangular incurved wings along its 

 outer edges. Anther-cells close together, parallel ; the pollinia broadly 

 ovoid, each with a short caudicle and a discoid gland lodged in a 

 pouch. Stigma large, extending on each side of the pouches and con- 

 cealed by the incurved wings of the column. 



Sikkim : at Chong-thang, elevation 5,500 feet, in flower during July. 

 Pantling No. 424. 



In externals this species resembles H. Prainii, Hook. fil. with 

 which it was at first confused. It is, however, perfectly distinct from 

 that species. This plant has the facies of a Habenaria, but the glands 

 and the bases of the caudicles of the pollinia rest in twin pouches, 

 after the manner of Ophrys. In fact it forms a connecting link 

 between Habenaria and Ophrys — hence the specific name which we 

 have proposed for it. 



Materials for a Carcinological Fauna of India. No. 2. The Brachyura 

 Oxystoma. — By A. Alcock, M.B., C.M.Z.S., Superintendent of the 

 Indian Museum. 



Plates VI— VIII. 



Received 7th May. Read 3rd June. 



The limits of the Tribe of Oxystoma here adopted are those 

 originally established by De Haan in the Fauna Japonica, and since 

 recognized by Ortmann in his account of the Decapod Crustacea of the 

 Strasburg Museum. 



I can hardly, however, go as far as Ortmann in uniting the 

 Leucosiidae and Baninidse in one section, Leucosiinea, co-ordinate in value 

 with the Dorippinea and Calappinea. Rather, it seems to me, the 

 affinities of the Haninidse are, through Cyclodorippe, with the Dorippidx. 

 But on the whole it seems enough to recognize the Baninidse as true 

 Oxystomes of equal rank with the Calappidx, Leucosiidx and Dorippidx, 

 just as De Haan practically does. 



