4l8 STUART VVELLER 



The dimensions of the specimen are : maximum diameter 34""°, height of 

 aperture 17™™, width of aperture 14""". 



— Walker Museum, Pal. Coll. No. 9712. 



Hamites elatior Forbes? Plate II, Fig. 3. 



1890. Hamites ^/a/zor Forbes ? White, Proc. U. S. Nat. Mus., Vol. XIII, p. 13. 

 PI. II, Figs. 1-2. 



Two specimens in the collection may be referred provisionally to the 

 genus Hamites. One of these is a fragmentary cast of the straight portion of 

 an individual whose diameter must have been about 60"'"'. On this specimen 

 the annular ridges are closer together than on the other one, the intervals 

 ranging from 3 to 4""", and on one side the annulations exhibit a shallow 

 sinuosity. The specimen seems to possess all of the essential characters of 

 H. elatior Forbes ? as identified by White from the Straits of Magellan and 

 is therefore so identified. — Walker Museum, Pal. Coll. No. 9709. 



Hamites sp. undet. Plate II, Fig. 4. 

 The second specimen referred to Hamites is a portion of the impression 

 of the exterior of a very large individual, which, judging from the curvature 

 of the fragment at hand, must have had a diameter of 80°"° or more. It is a 

 part of the straight portion of the shell with the crests of the annulations 

 about 6.5""" apart. The raised annular ridges are not symmetrical, the slope 

 on one side being more abrupt than on the other. 



— Walker Museum, Pal. Coll. No. 9710. 



ARTHROPODA. 



MALACOSTRACA. 



Decapoda. 

 Gljrphaea stokesi, n. sp. Plate I, Fig. i. 

 Description.— Cephalothorax highest toward the front, somewhat flattened 

 both dorsally and laterally, with a short, sharply pointed rostrum. Anterior 

 margin sinuate between the rostrum and the base of the antennae, it rounds 

 regularly into the gently convex ventral margin. From a little in front of the 

 middle of the ventral margin of the lateral surface of the cephalothorax a 

 a conspicuous rounded furrow is directed obliquely upward and backward, 

 crossing the flattened dorsal surface transversely at about one-third of the 

 total length of the cephalothorax from its posterior extremity ; from the same 

 point of origin at the ventral margin another furrow describes a sigmoidal 

 curve first forward, then upward and nearly vertical, and then forward and 

 nearly horizontal again, becoming less and less sharply defined to the ante- 

 rior margin just above the base of the antennae ; from this sigmoidal furrow 

 there are two shorter and less well defined furrows directed obliquely down- 

 ward and forward towards the antero-ventral margin. At the posterior 

 extremity of the cephalothorax a transverse furrow extends across the dorsal 

 surface close to and parallel with the margin. Between the two principal 

 furrows upon the lateral surface of the cephalothorax, and just above their 



