654 MR J. T. CUNNINGHAM AND MR G. A. RAMAGE ON THE 



Ammotrypane aulogastra, Rathke. 



Ammotrypane aulogastra, Rathke, Nov. Act. Nat. Cur., xx. 1, tab. x. f. 1-3. 

 Ophelina acuminata, Oersted, Consp. Ann. Dan., p. 45; Arch. f. Naturgesch., 



x. 1, p. 111. 

 Ophelia acuminata, Grube, Fam. Ann.; Johnston, Cat. Brit. Mus., 1865. 

 Ammotrypane aulogastra, Malmgren, Annulata Polych.; Of. k. vetensk. Akad. 



Forhand., 1865 ; M'Intosh, Fauna of St Andrews, 1875. 



The specific characters as given by Johnston are — Body fusiform ; snout 

 tipped with a small globule ; branchial cirri to all the segments ; anal extremity 

 spoon-shaped, with two small fusiform appendages in front of the vent. 



This is not quite correct: the 1st setigerous somite bears no branchia ; and 

 the spear-shaped anal extremity is provided with cirri round its posterior edge ; 

 and in addition to the two small fusiform appendages in front of the vent, a 

 long cirrus arises between these. This median cirrus usually lies in the hollow 

 of the spoon-shaped appendage, and is therefore not easily seen (figs. 15 to 

 15 c). 



A species of Opalina commonly occurs in the intestine of this species ; it is 

 of an elongated cylindrical shape, and towards one end repeated transverse 

 fissions take place, the resulting segments remaining for some time connected 

 so as to form a linear series (PI. XLII. fig. 15 d). 



Genus Ophelia, Savigny. 



Generic Character. — Longitudinal constriction limited to posterior two- 

 thirds of the body. 



Ophelia limacina, Sars (Rathke). 



Ammotrypane liniacina, H. Rathke, Nov. Act. Nat. Cur., xx. 1 ; Johnston, 



Cat. Brit. Mus.; Quatrefages, Ann. ii. 

 Ophelia bicornis, Oersted, Gronl. Ann. Dors. 

 Ophelia limacina, Sars, Nyt. Mag., vii. ; Malmgren, Ann. Polychseta, loc. cit.; 



M'Intosh, Fauna of St Andrews. 



The worm is thicker than the preceding species ; the notopodial cirri are 

 shorter and thicker, and confined to the posterior part of the body. The 

 longitudinal constriction begins behind the 8th somite (7th chaetiferous). The 

 posterior extremity has a circlet of small papillae. 



Found between tide marks at Granton. 



