154 EXOGONE GEMMIFERA (?) SCHARFFI. 



anterior eyes on the ventral surface, and a smaller dorsal pair. No proboscis existed, only 

 the alimentary canal. He decided these to be buds after the type of Tetraglene. 

 Langerhans previously had found a similar condition. 



So long a period has elapsed since the examples (which unfortunately have been lost) 

 occurred at St. Andrews and Lochmaddy that considerable doubt exists on some points, 1 

 but they appear to pertain to this species. 



EXOGONE GEMMIFERA ?, var. SCHAREFI. 



Head a smoothly rounded lobe divided by a constriction. Behind the latter on each 

 side is a pair of connate eyes with lenses, the anterior pair being large, the posterior 

 minute. Body 3 — 4 mm. in length, and composed of about thirty-six segments. It 

 terminates posteriorly in a slightly enlarged blunt process with two cirri. Proboscis a 

 short, narrow, straight tube. Proventriculus also short. The feet have lost the dorsal 

 cirri. Setigerous region conical, bearing a series of translucent bristles with the end of 

 the shaft dilated and notched like the cannon-bone of a sheep. The upper bristles have 

 a long tapering terminal piece, like that of Phyllodoce, whilst the inferior have a short 

 terminal piece with a claw at the tip. 



Habitat. — Amongst the bristles and hairs near the tail of Aphrodita aculeata procured 

 at Long. 55, R. I. Academy's Expedition, 1886. 



Head forms a smoothly rounded lobe with a constriction marking off an anterior 

 from a posterior region. Just behind this constriction at each side is a pair of connate 

 eyes, each with a clear lens-like body, the anterior large, the posterior minute. The 

 example had no tentacles or tentacular cirri, but the margin of the snout may have had 

 sensitive papillae. 



Body about 3 or 4 mm. long, elongated, composed of about thirty-six segments, the 

 first following the region on which the eyes are placed. Each segment consists of a 

 setigerous lobe and a short dorsal cirrus. 



The proboscis appears to be short, as the proventriculus commences at the fourth 

 bristled segment and ends behind the fifth. The intestine then passes backward to the 

 anus. Stretching from the mouth, which lies a little in front of the eyes, is a clear, 

 straight, narrow tube, which may represent the proboscis thus curiously reduced. 



The posterior end terminates in a slightly swollen blunt process with two cirri. 



The foot has no dorsal cirrus in the preparation, but it may have been lost. The 

 setigerous region is conical, and bears a series of translucent bristles with the distal end 

 of the shaft curved and slightly dilated, the end being notched like that of a sheep's cannon- 

 bone. The upper bristles have a long tapering terminal piece like that of a minute Phyllodoce. 

 The inferior bristles have a short terminal piece with a claw at the tip, but the whole 

 structure is so minute that whether it is simple or bifid could not be determined. 

 Apparently it is simple. In lateral view the bevelled region of the dilated end of the 

 shaft is truly Syllidean, and when seen on end the blunt point formed in those devoid of 

 terminal pieces is also characteristic. 



1 e. g., the dorsal or ventral attachment of the embryos. 



