\~]2 



1. IK EDA : 



the second and third longitudinal muscles a short distance behind the 

 roots of the ventral muscles. The intestinal convolution, consistine of 

 about twenty loose spirals, twists itself around the spindle muscle, which is 

 fixed to the posterior end of the body. There exists no fixing muscle. 

 A small rectal diverticulum (rg) is found attached to the very beginning 

 of the rectum. The dorsal vessel bears no contractile villi. The seg- 

 mental organs of a deep brown color are nearly half as long as the body- 

 proper, and are fixed to the body-wall along their whole length by a 

 mesentery. Their external openings lie slightly in front of the anus 

 (a) and between the fourth and the fifth longitudinal muscle. Xo eye- 

 spots. The tentacles, 8 in number, are lobose. 



The species described above seems to be most nearly allied to Phy- 

 mosoma lurco Sel. and Buelow and to Phymosoma rJiyzopJiora Sluiter. 

 But it differs from the former in the size of body, in the form of papillae, in 

 the size and form of hooks, in the form and mutual relations of the roots 

 of the retractor muscles, etc., and also in wanting diverticular appendages 

 to the segmental organs. It differs from the latter in the form of papillae, 

 especially of those on the introvert, in the relative position of the segmental 

 organs and the anus, and in the absence of eye-spots. 



Thalassema manjuyodense, n. sp. 



Pi. VIII., figs. 9 — io. 



Only one specimen, wanting the proboscis (fig. 9). The body is of a 

 broad spindle-like form, measuring 18 mm. in length. The skin bears a 

 grayish green tint. The papillae are very small, almost invisible with the 

 naked eye, except at the posterior end of the body where they are somewhat 

 larger and are arranged more or less in circular rows. The ventral hooks 

 are relatively large and of a golden yellow color. They are internally 

 provided with an interbasal muscle (fig. 10, im) which extends across over 

 the pharynx. The longitudinal muscles are divided into 14 broad bundles. 

 There are present two pairs of short and tubular segmental organs (so) 



