54 DR. R. V. WILLEMOES-SUHM ON SOME ATLANTIC 



which probably extends southwards from Greenland, and on which in the north are 

 situated the Azores, and in the south Tristan d'Acunha. Before getting to it from 

 Teneriffe we had the greatest depth of that section of the ocean, 3150 fathoms ; and after- 

 wards again we gradually came down to a depth of 3000 fathoms before getting into the 

 shallower water of the West Indies. On that plateau we got with the first specimen a 

 sponge, some Bryozoa, a Brachiopod, a Lamellibranchiate, a Gastropod, and a small 

 Shrimp, besides this magnificent Decapod, which was entangled in the swabs of the 

 dredge. With the second specimen a great many animals came up, among which I may 

 mention a Palythoa, a Fungia, and a Pennatulid. A Holothuria, an Archaster, and an 

 Urchin represented the Echinoderms. Crustacea were present in large numbers — espe- 

 cially Peneid and Caridid Shrimps and the Schizopods which I have called Petalophthal- 

 tnus and Chalaraspis, together with a large species of Euphausia. The smaller species 

 was got near Sombrero Island, W. I., in a depth of 450 fathoms, together with Astacus 

 zaleucus ; and in describing this species I have already given an idea of the fauna which 

 lives in the same place with these Crustacea. 



Characters of the Genus, and Systematic Position. 

 Willemoesia, Grote *. 



Carapace large, flattened, and quadrangular. Anterior margin and lateral borders 

 denticulated, the latter divided by two incisions into three denticulated portions. A 

 longitudinal line divides the carapace into a right and a left portion. Eyes and eye-stalks 

 entirely wanting. Euniculus of the first antennae rather large, its inner flagellum longer 

 than the outer one. Small lamellar appendage at the base of the second attennse, the 

 flagellum of which has the same length as the longer one of the inner antennae. Man- 

 ducatory portion of the mandibula very strong. A large flagellum attached to the second 

 maxilla. The palpus and flagellum of the maxillipedes reach the base of the first 

 antennae. No palpi at the base of the gnathopoda (second and third maxillipeds). Eirst 

 pair of pereiopoda very elongated, terminated by a slender pair of chelae. Subsequent 

 pereiopoda much shorter. 



Small styliform appendages at the inner side of the ramus interior of the pleopoda. 

 Abdomen flattened, divided by a longitudinal line of spines into a right and a left portion. 

 Telson rapidly decreasing in size, longer than the shield-like caudal appendages. 



1. W. LEPTODACTYLA, n. sp. 



Lateral borders of the carapace not very much expanded. Denticulation not very deep. 

 First pair of pereiopoda longer than the body. All the pereiopoda terminated by chelce, 

 Length 120 millims. 



2. W. CRUCIFERA, n. sp. 



Carapace with wing-like expanded lateral borders. Deep incisions and strong den- 

 ticulation at its lateral borders. Eirst pair of pereiopoda shorter than the body. Only 

 four pereiopoda terminated by chelce. Length 42 millims. 



* In ' Nature,' October, 1873. 



