Gatty Marine Laboratory, St. Andrews. 303 



dorsum ; six eyes — four median forming a square and tlie 

 other two external. Anal cirri slender. There are twelve 

 segments. The body is from 1"40 to 2 mm. in length, and 

 has about twenty-two bristled segments. 



De St. Joseph found a single ripe female, r40 mm. long, 

 at Dinard at the depth of 26 metres. There were twenty- 

 two setigerous segments. The median tentacle arises in a 

 line with the posterior eyes — a single pair of tentacles occur 

 on the achetous segment fused with the head. The eyes 

 agreed with the type, and so with the dorsal and anal cirri. 

 No dorsal cirri on the setigerous segments. The ventral 

 bristles have long tips with a simple extremity — long and 

 pectinate. At the seventh segment is a simple dorsal bristle. 

 Seventeen rows of glands (points gris) occur on the pro- 

 veuticulus ; stomach with lateral pouches. From the ninth 

 to the eighteenth segment four eggs in each, but no swim- 

 ming-bristles. He doubts if the form of Langerhans is the 

 same, since it differs in the pal|)s which are higher, and in 

 the position of the tooth in the pharynx which is in the 

 middle. Moreover, the bristles differ in structure, though 

 it must be said that neither is drawn with sufficient detail. 

 The number of eggs in each segment also differs. There is 

 perhaps room for doubt as to the separation of some of these 

 minute forms, even though they are apparently mature. 



Mr. Southern found another species, viz., Sphcerosyllis 

 lulhosa, on the rich -western coast of Ireland. In this the 

 head is oblong, with rounded corners, and bearing four large 

 eyes with lenses. The fused palpi are long and broad with 

 a faint dorsal furrow, but a conspicuous ventral groove. 

 Between the head and peristomium are the nuchal oigans. 

 The proboscis has a bluntly rounded tooth in front and a 

 series of soft papillge. Tliere are fourteen rows of glands in 

 the proventriculus. The body is 5-6 mm. long, and has 

 forty-eight setigerous segments, widest in the anterior third 

 and tapering toward each end. No pnpilhe occur on the 

 body, only on the feet and anal segment, which has two 

 cylindrical papillae with slightly enlarged bases. The spines 

 are stout with a bulbous tip, and the compound bristles are 

 few and have short terminal pieces. 



Sphcerosyllis oviyera, Langerhans, is another minute form 

 from the west coast of Ireland {Southern) and from 

 Plymouth {Allen). In this form the head has four large 

 eyes, the posterior pair nearer each other, the anterior a 

 little in front. The three tentacles are in a transverse line, 

 the median often in front of the anterior eyes. The palpi 

 are broad and flattened. The body is about I'o mm. in 



