Nemertinea (S:c.from (he Fulhlands. 280 



vanrrp. cxteiuls in almost a c*)ni[)k'te circle routMl the siih- 

 aiitaictic region, hetweeii tlie laiituiles of 50° and 77° S. 

 Tlie tact that it occurs also at the Falklands serves to render 

 tills circle still nK>re comjdete. 



There appears to be great variation in the size at which 

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

 collection, where the material was dredged from considerable 

 depths of water (-45-250 fathoms), tlie 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 wliicli reference has already been made, were also com[)a- 

 ratively small (not more than 1-45 mm.), and some of these 

 were sexually mature. The material both from South 

 Georgia 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 Macroci/slis roots. 



3. Linens sp. 



There is a single female specimen, belonging to a species 

 very distinct from L. corruc/atus, but taken with 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 elon^^ate 

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

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

 which occupy almost the entire space within the body-wall. 

 Tln^y measure 0'5-0*6 mm., or even more than this, in 

 dianii;ter. 



I do not feel justilied in attaching a speciHc ninie to this 

 single specimen. 



N P: M A T D A. 

 StENOLAIML'S, Maiio:', 1870. 

 4. Sleiiolaimus sen'alis, sp. n. 



The nematode most abundanily represented in the colJee- 

 lion is an interesting form which may be provisionally 

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

 amples only two are males. 



