STOKES COLLECTION OF ANTARCTIC FOSSILS 419 



point of origin, there is a subcircular, depressed-convex, node-like eleva- 

 tion, and between the two shorter furrows which are directed obliquely down- 

 ward and forward from the sigmoidal furrow is another similar subelliptical 

 elevation. Just back of the base of the antennae is a rather sharp, keel-like 

 ridge reaching backward to the first of the short oblique furrows. Back of 

 the base of the rostrum, upon the dorsal side of the cephalothorax there are 

 two small, sharply pointed tubercles upon each side of the median line ; the 

 anterior one is the larger and is situated almost directly in front of the smaller 

 posterior one. 



Abdomen consisting of six segments and a strong telson posteriorly, 

 altogether being as long or longer than the cephalothorax. 



The dimensions of the type specimen are : extreme length of cephalo- 

 thorax 32""", greatest height 14""™, length of rostrum 4™". 



— Walker Museum, Pal. Coll. No. 9705. 



Remarks. — This species is represented in the collection by a single specimen 

 which exhibits in good condition one side of the cephalothorax up to the dorsal 

 median line, with the segments of the abdomen and the telson attached but imper- 

 fectly preserved and recurved along the ventral side. Fragments of the legs and the 

 basal joint of one of the antennae are also preserved but not in such a condition as 

 to admit of description. The specimen represents a species which is quite distinct 

 from any of those previously described from the Cretaceous. 



EXPLANATION OF PLATES 



PLATE I. 



Fig. I. Glyphaea stokesi, n. sp. Lateral view of the type specimen. 



Figs. 2-3. Lucinaf townsendi White. 2. Laterial view of the right 

 valve of a small specimen. 3. A larger, less perfect specimen believed to 

 belong to the same species. 



Figs. 4-5. Lagena? antarctica, n. sp. 4. Lateral view of a wax cast 

 taken from a natural mould of the exterior. 5. The natural cast of the 

 interior of the shell. 



Figs. 6-17. Ttibulostiutn ciillosum. Stol. Three views each of four 

 different specimens. 



PLATE II. 



Figs. 1-2. Olcostephanus antarctica, n. sp. i. Lateral view of the type 

 specimen. In part an internal cast and in part an impression of the exterior- 

 2. Lateral view of a wax cast taken from the natural mould of the exterior. 

 Same specimen as Fig. i. 



Fig. 3. Hamites elatior Forbes ? Lateral view of an imperfect cast of 

 the interior. 



Fig. 4. Hmnites sp. undet. Lateral view of a plaster cast taken from 

 the natural mould of the exterior. 



Fig. 5 Haploceras ? sp. undet. Lateral view of the only specimen 

 observed. 



Stuart Weller. 



