^ Art. 2. — T. Kal.uraki: 



oblique, forwardly direcled tentacles. Tlie tentacles is pointed 

 rather than in the preceding species. The head is distinctly sepa- 

 rated hy a gentle neck-like constriction from the trunk, which 

 presents lateral margins running nearly parallel for the most part. 

 The greatest breadth is seen behind the middle of the body, in tlie 

 pharyngeal region, from which the trunk gradually tapers to an 

 obtusel}' pointed end. The mature worm in the fully extended state 

 usually reaches 18-20 mm. in length and 2-2-5 mm. in breadth. 



Colouration. — The dorsal side of the body is generally of a 

 darkish olive-like brown colour, being much darker than in Foil/, 

 auricidata. At the frontal end, on the lateral mai-gins and in the 

 median line the colour is. somewhat lighter than elsewhere. On 

 the outer side the region of the pharynx and copulatory organs may 

 be, as usual, discerned to a certain degree in clear spaces- The 

 ventral side is much paler, revealing even the ovaries, the testes 

 and the longitudinal nerve cords as dark spots or stripes. 



Eyes. — Numerous small eye-spots, increasing in number with 

 the growth of the body, are arranged in a single row along and 

 close to the margins of the head, thus forming a horse-siioe-shaped 

 tract which does not extend so "Tar behind as in Po/y. auriculata. 

 In a few large specimens the eyes number 28-39 on either side. 



Body Wall. — The epidermis is composed of a single layer of 

 columnar cells which are much higher on the dorsal side than on 

 the ventral. It contains minute spindle-shaped rhabdites which 

 are situated between the cells. Deep below the epidermis, in the 

 parenchyma, are found such rhabdites as are still enclosed in their 

 mother-cells. Numerous glands, deeply situated in the paren- 

 chyma, are seen to open on the ventral surface towards the sides 

 of the body as well as at various points of the entire surface of the 

 body. The dermal musculature consists, as usual, of the outer- 

 most circular, the middle transverse and the innermost longitudinal 

 layers. Of these the longitudinal layer is the best developed and 

 appears associated in distinct bundles. 



Digestive System — In the fully grown forms the mouth-open'- 

 ing hes slightly behind the hind end of the middle third of the 

 body-length. The pharynx, which is of a cylindrical shape, is 



