424 G. WYNHOFF. 



sometimes these stripes are broken up into patches, which give the 

 animal a speckled appearance. The ventral surface is white. Cerebral 

 organs at a great distance in front of the brain. Numerous small eyes 

 arranged in four clusters. The oesophageal diverticulum sends two 

 pouches to the brain. Both the central stylet and its basis are short 

 and stout ; they are of the same length. Two pouches, each with three 

 accessory stylets. Length to 46 cm., breadth J cm, 



3. Emplectonema echinoderma {Mar.). (Biirger. Monogr. T. II, 

 Fig. 3.) 



Locality : One specimen from Millbay Pit. 



Burger's figure gives a very good idea of the Plymouth specimen ; 

 the head shows the same form and markings. The colour is generally 

 a more orange-red. A number of very small eyes, arranged in a row, 

 are situated on the margins of the head ; they do not show very much, 

 which is probably due to the want of clearness of the tissues of the 

 head, and they certainly were not so numerous as those described by 

 Burger. The transparent hooks are quite characteristic. Length 

 120 mm., breadth l|-2 mm. 



Geographical distribution : Mediterranean, Madeira, and Plymouth. 



Genus Carcinonemertes. 



Head without distinct lateral grooves, not demarcated from the 

 body. Ocelli 2. Mouth and proboscis open together; oesophagus 

 extremely short, opening broadly into the intestine through a large 

 muscular chamber. Proboscis but little developed, very small in size 

 and extremely short, without lateral pouches of reserve stylets, but 

 armed with a central stylet and basis only. 



1. Carcinonemertes carcinophila (Koll). (Joubin. Les N^mertiens, 

 PL III, Fig. 81. Mcintosh. Monogr. PI. I, Fig. 5.) 



This parasitic Nemertean lives in self-secreted tubes between the 

 egg masses of Carcinus maenas and Fortunus depurator. Only two out 

 of a great number of Carcini I examined were inhabited by this worm; 

 one specimen in each. On Porhinus, however, it was more common, 

 especially in specimens from dredgings. If the crabs had been collected 

 on shore I never found them inhabited by this parasite. The tube, 

 in which the orange or pale reddish animal folds itself together, is 

 attached to the axis of the feet that bear the eggs. I have not been 

 able to find any nemertine on the gills either of Fortunus or of Carcinus 

 or Galathea. 



This species was with certainty known only to occur on Carcinus 

 maenas; probably Galathea strigosa and Xantho Jioridus may also be 



