N. ODHNER: THE GENUS CUMANOTUS. 



83 



In both forms the soft parts fully agree in shape. On the head 

 there are situated two small conical tentacles of the same size and 

 position in both, connected by a low cutaneous fold. The rhinophores 

 are close to each other, and are united at the base. The foot is 

 extended, forming two pointed angles at the frontal sides, and is 

 expanded laterally and posteriorly to a cutaneous border. 



The arrangement of the dorsal papillae is also of the same character 

 in both. They are set in about 12 transverse rows, the o foremost 

 ones being placed in front of the rliinophores. The rows are in two 

 groups, a pre-anal and a post-anal one, the first embracing 6 rows; 

 the anus is situated dorso-laterally, immediately in front of the Vth row. 



As to the number of papillae, this has been easy to determine in 

 C.heai'montijov all the papillae there were intact; in C. laticejjs, on 

 the other hand, they had fallen oil' to a great extent, and the state- 

 ments here given are therefore deduced from the markings. One 

 specimen of each form was examined. 



The number of papillae was as follows : — 



In tlie 1st row 



„ 2nd „ . . . 



„ 3rd ,, . . . 



„ 6tli „ . . . 



„ 7th ., . . . 



„ 8tli „ . . . 



„ 9th „ . . . 



„ 10th 



The unimportant difference which was present in the two specimens 

 examined may be ([uite individual, and any attempt at deducing 

 specific characters is therefore excluded. 



Anatomically the papillae are of the same structure, for in both 

 forms they are furnished, at the tips, with a saccus cnidophorus, which 

 is connected with the liver process by means of a narrow, winding 

 canal. 



Of all the characters distinctive of the genus Cumanotus, the shape 

 of the female copulatory organ is the most peculiar. To the sides 

 of the bursa copulatrix there are attached two circular pads with 

 a papillated margin, and these papillae are of the same number, 12, in 

 both forms. Such difference in dimensions as was observable in 

 homologous parts is to be explained by their different stages of 

 maturity. 



Thus exteriorly the soft parts show an entire conformity, and from 

 thein conReriuently no specific characters are obtainable. There only 



