Entozoa oj British Marine Fm/ies. 11 



Slephanochasmus trijlw^ Lcbour *. 



From the intestine of Trigla gurnarduaf a single spccimoin 

 of what can hardly fail to be this species was ohtained. The 

 species is exceedinj^ly like St. baccatus^ and, as far as can bo 

 made out, practically the only difference to which any 

 importance can he attached is in the number of cephalic spines. 

 Miss Lebour did not determine this number, but in the 

 specimen under consideration it apjx'ais to be 50, i. e. 25 in 

 each row. This difference of six spines may or may not be 

 a feature of specific distinction ; if not, the two species must 

 be considered identical. After a careful examination of 

 liliss Lebour's description and my own specimens the only 

 other feature of ditierence to be found is in tlie extent of the 

 yolk-^lands, which reach the ventral sucker in St. triyhe but 

 stop sliort of it in St. baccatus. This, however, is a rather 

 hazardous dist'nction. 



The cephalic spines surround the oral sucker in two un- 

 interrupted rows, and they measure '03 mm. in the anterior 

 row and '035 mm. in the posterior row. In my specimen 

 the spines in the posterior row, instead of being directed 

 straight backwards, diverge slightly from the middle line, 

 but this condition is probably accidental. The spines over 

 the rest of the body appear to be more numerous and thickly 

 set than in St. baccatus, aiid their distribution is possibly 

 more extensive. 



The length of the specimen is 2'9 mm., of wiiich the neck 

 comprises 1 mm. ; the breadth is 6 mm. Diameter of oral 

 and ventral suekers '20 mm. anil "27 mm. respectively; 

 prepharynx '32 mm. long ; pharynx '17 X '15 mm. ; oesopha- 

 gus almost absent. Testes elongated oval, measuring '36 X 

 •24 mm., not quite contiguous, separated by yolk-glands. 

 Ovary '17 mm. in diameter, separated from testes by yolk- 

 glands. Latter extend as far forwards as the posterior border 

 of the ventral sucker. Cirrus-pouch not extending beyond the 

 ventral sucker to a greater distance than the diameter of the 

 sucker, as in «S^ baccatus. The specimen contained no ova. 



D ihemisiephanus lydice (Stossich). 

 (PI. I. figs. 2, 3.) 

 Sto8«:h, Boll. Soc. Adriat. xvii. (1806) p. 4, pi. i. fig. 1, 

 Looses Ccntralbl. f. Bakt. xxix. (1901) pp. GOo-tJOG & C28, fifj. 6. 



In the intestine of a sunfish {Mola moJa), captured in the 



• North uuilwrlanJ Sea Fisheries Rep. 1907 (1908), pp. 47-48, pi iii 

 fijrs. y-4. 



t In a recent note (Ann. & Mag. Nat. Hist. (8) iii. p. 246) this speci- 

 men was inadvertently referred to Cottxu scorpitis. 



