PLYxMOUTH NEMERTEANS. 413 



parent. Eleven white belts are present; the first constituting the 

 separation between the intense coloured and the oesophageal region. 

 Just in front of the second ring one pair of white patches is con- 

 spicuous; they are connected with this belt and are situated in the 

 dorsal red stripes. I have not found any trace of side organs. 



II. Fam. CALLINEKIDAE. 



Cerebral organs absent. Nervous system situated between the basal 

 membrane and the outer circular muscle layer. A thick nervous layer 

 is present in the head. Inner circular muscle layer present. A 

 median dorsal blood-vessel fails ; four blood-vessels in the head. 

 Ehynchodaeum with a separate layer of longitudinal muscle fibres. 

 Proboscis anteriorly, with four longitudinal muscle bundles, followed 

 by a diaphragm. 



Genus Carinesta. 



No composite gland cells in the epithelium. Oesophageal nerves 

 paired ; no lateral sense organs. Diagonal muscle layer absent. Pro- 

 boscis attached behind the mouth. Proboscis sheath without any 

 peculiarities of musculature. 



1. Carinesta anglica. Nov. spec. 



Locality : one specimen was collected from the river Yealm at low 

 tide by digging in a muddy sandbank ; and one fragment crawling 

 about in sand from Whitsand Bay. 



This white nemertine somewhat resembled Punnett's description of 

 Oxijjjolia heaumontiana. The snout is elongated and pointed ; when 

 contracted the wrinkling is obvious. Colour a watery milk-white 

 anteriorly ; the gonads give the posterior part a rosy-brown tint. The 

 mouth had been protruded obviously in the fragment from Whitsand 

 Bay. No sense organs are present, nor could I distinguish the pro- 

 boscis pore. The proboscis itself and the intestinum are easily visible 

 because of tlie transparency of the animal. 



The posterior part of the body was much swollen and contracted at 

 irregular intervals when the animal was first examined ; on touching 

 it broke into pieces. 



Sectioning revealed the very interesting structure of this animal, 

 which I was able to identify as a Carinesta species. From Punnett's 

 type specimen, however, which was collected at New Britain, it differs 

 in the total absence of that part of the inner circular muscle layer, 

 which is already disappearing in G. oricntalis. Moreover, a head gland 

 exists in C. anglica and fails in Punnett's specimens. I could not find 

 any traces of a dorsal decussation of fibres, nor is there any special 

 longitudinal muscle sheath at the ventral side of the oesophagus. 



