Nemertinea d:c. from the Falklands. 203 



posteriorly. There is a sliglit bulbous expansion of the 

 cuticle just before the tip. At the extreme tip there is a 

 distinct pore, froui which there may sometimes be seen 

 issuing a coagulated stream of the secretion from the caudal 

 glands, which are well developed. 



Tlie minute pore of the excretory gland (fig. 1, Ex. P.) is 

 situated close behind the iiead, the duct expanding into a 

 sliglit ampulla {Am.) just before the opening. 



The spicules of the male (fig. 2, 8.) are very slender 

 curved rods ; there is apparently a slender accessory piece 

 {A. P.) near their distal ends. In the male the posterior end 

 of the body is well provided with diagonal mnscle-bandsj 

 probably serving to bring about the ventral coiling of the 

 tail. 



In the female the genital organs are characteristic. The 

 vulva is anteriorly placed, and the two branches of the uterus 

 are very unequal, the posterior branch being 4| times as 

 long as the anterior. Both ovaries are doubly retlexed, i. e., 

 bent back upon the uterus and bent back again upon them- 

 selves near their blind ends. 



This species appears to be common between tide-marks, 

 occurring under stones &c. at Roy Cove. It agrees with 

 Sttnolainius marioni, Southern (1914), and differs from the 

 type-species, S. leplurus, de Man, in the absence of any hairs 

 on the neck besides the cephalic crown of bristles. It; may 

 be remarked that no lateral organs are mentioned in the 

 descriptions of either of these species ; it is therefore doubtful 

 whether the rows of pits described above for S. serialis are of 

 generic or only of specific importance. It is possible that 

 the species should be regarded as belonging to a new genus, 

 with close relationships to Steuolaimus and Anticoina. 



DOLICHOLAIMUS, de Man. 



5. DoUcholaimus vallentini, sp. n. 



The collection includes three examples of a species which 

 is undoubtedly to be referred to Dolicholaimus. Of these 

 specimens, one is a male, one a female with ovaries developed, 

 but containing no fu ly-formed eggs, and the third an imma- 

 ture lornj of doubtful sex. 



Tlie following are the measurements (in mm.) of the two 

 mature individuals : — 



6. ?. 



I.eugth 3-47 3-40 



Thickness — at crown of hairs 00275 003 



Ann. & Mag. N. Hist. Ser. 8. Vol. xvii. 2U 



