A. E. Yevrill — Marine Nemerteans of New England, etc. 413 



Body much elongated in extension, sometimes almost filiform, very 

 contractile, rounded or a little flattened. Head not very distinctly 

 defined ; in some cases with a pair of longitudinal or oblique, shal- 

 low, submarginal fossa? on the upper side ; in other cases {E. gracilis) 

 without evident fossae. 



Ocelli variously arranged, often numerous and in several clusters, 

 both anterior and cerebral. 



Proboscis relatively small, especially the anterior portion, which is 

 much shorter than in Aniphiporus. Mouth usually (always V) separate 

 from the proboscis-pore. 



For this geinus the earliest available name seems to be tliat given 

 by Stimpson, who named as type E. camillea (Quatr. sp. = E. Neesii 

 Oersted sp.), which is also the type of the genus Netnertes of Mc- 

 intosh. The latter name could not be retained in this sense, even if 

 the genus had not received a prior name, for Nemertes had already 

 been used for a genus of insects by White in 1850, in addition to 

 its prior use for several distinct genera of Nemerteans. Had not 

 Stimpson's generic name been available, 3Iacronemertes would have 

 been next in order, 



Emplectonema giganteum Verrili. 



MacroiiKiiierttifi giguntea Verrili, Amer. Journ. Sci., vol, vi, p. 439, pi. 7, tigs. 2, a, b, 

 1873; Expl. of Casco Bay, lu Proc. Amer. Assoc, for 1873, p. 390, pi. 2, figs. 

 5, 6, 1873. 



PLATE XXXV, FIOURE 2. PLATE XXXVIII, FHiURES 12, 12rt. 



Size large. Body much elongated, very contractile ; in extension, 

 subterete, a little depressed, thickest anteriorly, gradually tapering 

 posteriorly, becoming very slender and considerably flattened toward 

 the end. Integument very soft, secreting a large quantity of mucus. 

 Head not distinct from the body and of the same diameter, obtusely 

 rounded in front, with a terminal proboscis-pore ; upper surface with 

 two shallow, indistinct, sublateral, longitudinal fosscC, often becom- 

 ing more distinct in alcohol ; below with two rather indistinct, 

 obliquely transverse grooves or fossct". 



Ocelli numerous, but not veiy distinct, because deeply buried in 

 the integument ; they are numerous, arranged in four or more clus- 

 ters ; a pair of large oval or subtriangular clusters on the antero- 

 lateral border of the head, each of which may be divided into an 

 upper and a lower grouj), the u})per part running backward ; a pair 

 of smaller lateral clusters farther back ; and a pair of small rather 

 indistinct clusters on the dorsal surface, between the longitudinal 

 fossfB. 



