A. E. Verrill — 3Iarine JVemerteanfi of JVew England, etc. 437 



Head versatile, in extension decidedly long and narrow, often nar- 

 rower than the body, regularly tapered to the acute tip. 



Mouth large, elongated, with slightly crenulated white lips ; its 

 anterior end is about opposite the posterior ends of the lateral slits. 



Lateral cephalic slits long and deep, with thin, translucent mar- 

 gins, often curved back so as to show the large interior cavity ; in 

 front they run very close to the proboscis-pore, which, in contrac- 

 tion, appears as a sub-terminal vertical slit. Proboscis very lono- and 

 slender, pale pink in color. No ocelli. Cephalic ganglions laro-e 

 showing through the integument as dark red spots. 



Color of body dull red, or rose-color, or pale purplish, somewhat 

 lighter beneath ; usually with a lighter colored median line, and a 

 red spot in the head corresponding to the ganglions ; front of head 

 and mouth area Avhitish ; the closely arranged c;ecal lobes of the in- 

 testine often show through the integument, especially beneath, as 

 a pale brown baud along each side. These ctecal appendages are nu- 

 merous, and many of them are divided into two or three lobes dis- 

 tally. 



Very common, burrowing in sand near low-water mark, from New 

 Jersey to Cape Ann, Mass. It is abundant near New Haven, Conn.; 

 Thimble Islands and Noank, Conn.; Newport, R. I.; and Wood's 

 Holl, Mass. 



This is a more strictly littoral species than the preceding. It sel- 

 dom occurs much below low-water mark. The mucus that it secretes 

 is more tenacious than that of most species, so that captive s])ecimens 

 often cover themselves quickly with adherent sand. 



This species is generally found associated with C. lacteus, from 

 which it can easily be distinguished by its decidedly red color, and 

 its narrower and more slender body, without the very thin margins. 

 It is also a more sluggish species and seldom swims freely. It is 

 prone to break itself in fragments when captured. 



It is unfortunate that the name roseus, which applies so well to 

 this species, cannot be retained on account of the much earlier named 

 Mediterranean species. I have, therefore, given it a new name in 

 honor of Professor Leidy, who tirst described it. 



It is quite probable, however, that C. rubra {=:Iie?iierla rubra 

 Girard, op. cit., p. 366, 1854) is identical with this species. Girard's 

 description is too brief and indefinite to determine this question. 

 He describes C. rubra as uniform brick-red, paler beneath, and as 

 lacking eyes ; length 5 to 6 inches. Its form was nearly as in the 

 present species. It was from Charleston, S. C, on sand-tiats at Fort 

 Johnson. 



