186 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



Family Gryptocelidae 



Cryptocelis insularis, new species 

 Figs. 3 and 4 



Material. — One specimen taken at station 66-33, Tagus Cove, Albe- 

 marle Island, February 9, 1933, on sandy bottom, at 10 to 20 fathoms. 



Anatomical description. — The worm is an elongated oval in shape, 

 rounded anteriorly and more pointed posteriorly. It measures 17 mm 

 long and 8 mm wide across the anterior third ; but as it was much folded 

 and contorted, it is probably longer when extended in life. The appear- 

 ance of the worm after straightening is shown in fig. 3. A narrow band 

 of marginal eyes extends around the anterior fourth of the body margin. 

 The cerebro-frontal eyes are few in number and extent compared to 

 those of other species of this genus; they form two bands that extend 

 over the brain region. It is usual in the genus to find tentacular eye 

 clusters on either side of the brain ; and in the present species there is a 

 little group of about four eyes on each side of the rear part of the cerebro- 

 frontal bands that could be regarded as representing tentacular eyes. 

 The color of the animal was not determinable. All that was seen of the 

 digestive tract is the small ruffled pharynx shown in fig. 3 ; it is bounded 

 on either side by the coils of the uteri full of eggs. 



The male copulatory apparatus, located shortly behind the pharynx, 

 is typical of the genus and enables generic recognition in the cleared 

 whole mount. It is a very elongated oval muscular body. The copulatory 

 region of the worm was removed and sectioned sagittally. A median 

 sagittal view of the copulatory complexes is shown in fig. 4. As the 

 sperm ducts approach the male apparatus, they acquire thick muscular 

 walls and become spermiducal bulbs. These gain the ventral side of the 

 anterior end of the male apparatus, where they lose their muscular walls 

 and become narrow tubes; then they at once unite to form a common 

 duct that penetrates the muscular wall of the prostatic vesicle, ascends in 

 this muscular wall, and enters the anterior end of the prostatic vesicle. 

 According to Bock (1923), the whole of the long muscular body is to be 

 regarded as a prostatic vesicle. It consists of a thick muscular coat, a 

 glandular interior that occupies its anterior half, and a duct in its pos- 

 terior half. The glandular region is divisible into two parts — an anterior 

 one that takes the eosin stain and is composed of narrow transverse 

 chambers, and a posterior one that stains blue in haematoxylin and has a 

 very different histological appearance from the eosinophilous region. This 



