BY N. A. COBB. 



419 



Hah. — North Arm, Port Adelaide, South Australia, 1891."^ 



XI. SOLENOLAIMUS, new genus. 



The worms of this genus are short-necked and possess a narrow 

 tubular pharynx. The anterior half of the oesophagus is narrow 

 and weak, but the posterior half is large and muscular. The 

 female sexual organs are asymmetrical. 



•8 1-4 — f 



99-4 



S. OBTUSUS, n.sp. -3-^4 — ^ ^ q 21-5 mm. The thick trans- 

 parent skin is destitute of striae. The hairs are papilla-like and 

 occur throughout the length of the worm. 

 The neck is conoid, the head is rounded. 

 The short spike-shaped cephalic setse are 

 all submedian in position and are arranged in 

 two circles ; the posterior 

 row is half-way between 

 the lateral organs and the 

 mouth, while the anterior 

 is much nearer the mouth. 

 The minute lips are sup- 

 plied with papillae or teeth. 

 The circular (?) lateral 



Fig. 13.— I, female of 

 Solenolaimus obtusus. II, 

 III, and IV, head, neck, and 

 tail of the same worm more 

 highly magnified. 



organs are about one-sixth 



ft, posterior end of oesopha- 

 gus. 



b, cephalic setae. 



c, tubular pharynx. 



d, lateral organ. 



e, blind end of ovary. 

 /, oesophagus. 

 g, lateral organ. 



h, oesophagus. 



i, nerve-ring. 



j, posterior Welling. 



k, vulva. 



I, cardiac collum. 



m, anus. 



as wide as the head and are 

 situated opposite the poste- 

 rior end of the pharynx. 



The anterior half of the cesophagus is spindle- 

 shaped and in its widest part one-third as wide 

 as the neck ; the muscular posterior half is 

 three-fourths as wide as the neck. The cen- 

 tral constriction is surrounded by the nerve-ring. The cardiac 

 collum is distinct and the cardia large and prominent. The 



* Since writing the above on Chromagaster (most of it in 1888), I have 

 read Dr. rle Man's description of his new genus Siphonolahnus. There is 

 great resemblance in our species, but they are beyond doubt distinct. The 

 genera will probably have to be united. I have failed to clearly see the 

 spear-like structure mentioned by Dr. de Man and also the accessory orgaHS' 

 on the tail-end of the male. 



k:^ 



V 



