1897.] ON THE PLAJ^KTON OF THE TAEEOE CHANKEL. 803 



HxLAMBATES JOHNSTONi, sp. D. (Plate XLYI. fig, 4.) 



Vomerine teeth in two small groups between the choanse. Head 

 much broader than long ; snout rounded, as long as the diameter 

 of the e3'e ; interorbital space as broad as the upper eyelid ; tym- 

 panum two thirds the diameter of the eye. Fingers with a 

 slight rudiment of web ; toes half-webbed ; disks weD deve- 

 loped ; inner metatarsal tubercle large, compressed, crescentic, 

 very prominent. The tibio-tarsal articulation reaches the eve. 

 Skin smooth above, granulate on the throat, belly, and lower surface 

 of thighs. Purplish or brown above, with a more or less distinct 

 dark triangular marking on the back, the apex reaching the 

 occiput; Avhite dots usually scattered on the back; limbs with very 

 indistinct dark cross-bars ; a white streak borders the upper lip, 

 the outer side of the forearm and band, the anal region, the heel, 

 and the outer side of the foot ; hinder side of thighs dark brown ; 

 lower parts white. 



Prom snout to vent 42 millim. 



Closely allied to H. anchietce, Bocage, from Angola. 



Three specimens from Kondowe-Karonga, and one from the 

 Nyika Plateau. 



EXPLANATION OF PLATE XL VI. 



Fig. 1. Lygosoma johisto7n, Blgr. Side views of head and anterior portion of 

 body and pelvic, region, and upper view of bead (p. 801). 



2. Gli/pholymis whyfii, Blgr. Upper, lower, and side views of head (p. 802). 



3. Arthroleptis whytii, Blgr (p. 802). 



4. Hylamhates johnstoni, Blgr (p. 803). 



9. Contributions to our Knowledge of the Plankton of the 

 Faeroe Channel.— No. III.^ The Later Development of 

 Arqchnactis albida (M. Sars), with Notes on Arachn- 

 actis bournei (sp. n.). By G. Herbert Fowler^ B.A., 

 Ph.D., Assistant Professor of Zoology, University 

 College, London. 



[Eeceived June 15, 1897.] 

 (Plate XLVn.) 

 Arachnactis albida (M. Sars). 



This beautiful floating Actinian was originally described by 

 Michael Sars in_1846 (loc. cit. infra); it has since been takeii 

 on several occasions, and has received quite a large amount of 

 attention. 



The recorded occurrences and the references to descriptions are 

 most simply put in tabular form. They all refer to surface 

 captures, often in company with shoals of Salpa. 



1 For Part I. see P. Z. S. 1896, p. 991 ; Part U. antea, p. 523. 



