712 MR, F. F. LAIDLAW ON THE POLYCLAD [Juiie 19, 



the animal is crawling. It is about 2 inches long but narrow, and 

 contracts considerably when killed. In appearance it reminds one 

 of a horse-leech, but never swims. It is common everywhere 

 where suitable crannies in the rocks occur." 



The arrangement of the eye-spots at the anterior end of the 

 body is shown in text-fig. 112 (p. 7 1 1 .) The marginal spots form a 

 continuous series round the body. This complete ring of eye-spots 

 serves at once to distinguish the present species from the type of 

 the genus, L. atlcmticus Plehn [1896], which is recorded from the 

 same neighbourhood. In fact L. iplehni resembles much more 

 closely L. argus from the Straits of Mala,cca. In respect to the 

 structure and arrangement of the internal organs of the body, 

 L. plehni shows no noteworthy depai'ture from that found in the 

 typical species of the genus, 



Cestoplanid^, 

 Cestoplana rubeocincta (Grube), 



Cestoplana ruhrocincta Lang [1884] pp. 516-520, Taf. ii, fig, 5. 

 " Under stones at low tide, Boa Yesta, 

 " Very contractile. " ( 3 . ) 

 A small specimen 30 mm, long, 3 mm, broad. 



Anonybiid^. 



Anonymus virilis Lang (?). (Plate LII, fig, 3.) 



Anonymus virilis Lang [1884] pp. 522-523, Taf. ii. fig. 4. 



Dredged amongst nullipores, 3 and 10 fathoms, St, Vincent 

 Harbour. (8. W. 3.) 



" Pink or brownish pink with a white transparent border. 

 Under a simple lens the central part of the body shows a network 

 of broken light-brown lines, the main lines being radial. Marginal 

 eyes extend half way down the sides of the body (at least). General 

 texture thick and soft, shape broadly oval, margin wavy when 

 crawling." 



Unfortunately this interesting species is evidently a most 

 dilficult creature to preserve satisfactorily. All Mr. Crossland's 

 specimens are coated thickly with foreign particles felted together 

 by the copious epidermal discharge. In the second place, they 

 are all extremely contorted, and any attempt to flatten them for 

 examination results in the breaking of the soft body. Two 

 specimens are already broken into fragments in the bottle. Hence 

 I give only an incomplete accoiuit of them here. The larger 

 specimens are about 12 mm. long and 7 mm. wide. In colour, 

 distribution of the eye-spots, and arrangement of the penes (of 

 which there are ten or eleven pairs) they resemble closely Lang's 



type. 



Sections were cut of a specimen which has the body crowded 

 with large eggs, and contanis spermatozoa in the " Samenblase " 

 of the penial structures, although thq numerous testes have not 

 reached a condition of maturity. 



