Nemerlinea &c. from the Falklands. 289 



range extends in almost a complete circle round the sub- 

 antarctic region, between the latitudes of 50° anti 77° S. 

 The fact that it occurs also at the Falk binds serves to render 

 this circle still more complete. 



There appears to be great variation in the size at vvliich 

 this species attains sexual maturity. In the 'Terra Nova' 

 collection, where the material was dredged from considerable 

 depths of water (45-250 fathoms), the sexually mature 

 individuals were generally of large size (about 50 cm.). 

 Among the present collection, on the other hand, an example 

 not more than 65 mm. in length was found to contain well- 

 advanced female gonads. The examples from South Georgia, 

 to wliich reference has already been made, were also compa- 

 ratively small (not more than 145 mm.), and some of these 

 were sexually mature. Tlie material both from South 

 Greorgia and from the Falklands was taken in shallow water. 

 It seems not improbable that the depth at which the worms 

 live has some effect upon their growth, so that those which 

 live close to the shore never attain so large a size as those in 

 deep water, but are, nevertheless, capable of becoming mature. 



Loc. Roy Cove, etc., at low water ; sometimes washed 

 ashore among Macrocystis roots. 



3. Lineus sp. 



There is a single female specimen, belonging to a species 

 very distinct from L. corrvgatus, but taken wilh it at low 

 water, spring tides, 1902. It is about 30 mm. long and a 

 little less than 2 mm. in diameter. The skin is smooth. 

 The head is rather narrow and provided with elongate 

 cephalic slits. The mouth is indistinct, and is probably very 

 small. The most striking feature is the large size of the ova 

 which occu[)y almost the entire space within the bod}-vvall. 

 They measure 0'5-0*6 nnn., or even more tiiau this, in 

 diameter. 



I do not feel justified in attaching a specific name to this 

 single specimen. 



N E M A T D A. 



Stenolaimus, MaiioM, 1870. 

 4. Stenoluimus sen'alis, sp. n. 



The nematode most abundantly represented in the collec- 

 tion is an interesting form which may be provisionally 

 referred to the genus Stenolaimus. Out of twenty-six ex- 

 am oles only two are males. 



