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 Note on a Specimen oj Menohranchus. 199 



some respects it closely resembles 0. canal iculatuni, (Sow.) of the 

 English Wenlock. 



4. Theca Forhesii, — (Sharpe.) A little Ptcropod ia Mr, 

 Honeyman's collection, appears perfectly identical with this 

 species which is found in the Ludlow of England, and which 

 resembles the T. triangularis, (Hall) of New York. 



5. Pleurotomaria, — A flattish species with four turns, and inter" 

 esting as being apparently the same with one common in the 

 supposed equivalent of the Upper Arisaig group at Nictaux. 



6. Plafyostoma, — A species allied to P, Niagarensis of Hall. 

 T. BelleropTion, — Diameter, J inch, carina prominent and broad, 



outer and umbilical slope of whorls steep and straightish, so as to 

 give a somewhat rhomboidal cross section, surface with strong 

 sharply waved transverse strire, crossed by finer longitudinal striae, 

 cast of interior nearly smooth, with traces of transverse striae. 

 This shell much resembles Hall's B^ stigmosa from the Clinton. 



8. BelleropTion. — Two imperfect casts representing forms simi- 

 lar to B. expansus and dilatatus. 



9. Zaphrenitis, — A cast not sufficiently perfect for specific deter- 

 mination, but not unlike imperfect specimens from the Devonian 

 of Nictaux. This specimen is from Lochaber Lake.] 



ARTICLE XLH. — JVote on a specimen of Menobranchus lateralis, 

 taken at London, C. W. By "W. Saunders, Esq. 



Total length 4| inches ; body 3 inches ; tail 1 J inches. Dull 

 olive on the upper surface, the under of a dull, pinkish colour. 

 A dark (not well defined) stripe, mottled olive and black, run- 

 ning from the head (where it is wide) to the tail, where it 

 tapers off to a point. Broad stripes of the same character from 

 the mouth along each side to the tail. The legs are very short, 

 not quite half an inch long. On each foot there are four toes 

 The legs are olive with black spots, but the tips of the toes are 

 of a light colour. The eyes are very small and not readily seen. 

 The head is flat and almost triangular on its upper surface. The 

 branchial plumes are six, three on each side, about an eighth o 

 an inch long, and of a bright red colour which can only be seen 

 when they are extended in the act of breathing. 



The anin[7al was found in the river Thames, close to this city 

 between two and three months since, in a half torpid state, under 

 a large stone. It was immediately transferred to my aquarium 



