98 Papers from the Marine Biological Laboratory at Tort it gas. 



Plate 27. 

 Microcotyle incisa sp. nov., from Neomcenis griseus. 



Fig. 226. Dorsal view, balsam; length 2.30 mm. 



Fig. 227. Ventral view of head, balsam; diameter 0.09 mm. 



Fig! 228. Dorsal view of head, balsam; diameter 0.09 mm. n, coarse pig- 

 ment granules beside esophagus. 



Fig. 229. Lateral view, life, caudal region distorted by pressure; length 2.4 

 mm. 



Fig. 230. Two pairs of caudal suckers. Diameters of single sucker 0.06 and 

 0.03 mm. 



Deontacylix oval-is gen. et sp. nov., from Kyphosus sectatrix. 



Fig. 231. Ventral view, balsam; length 1.86 mm. a, mouth; c, ejaculatory 



duct; n, n, lateral bands uniting anteriorly above the esophagus 



and resembling nerves. 

 Fig. 232. Posterior end, dorsal view, of another specimen, balsam; diameter 



at level of ovary 0.6 mm. 

 Fig. 233. Ventral view of anterior end showing the minute mouth; greatly 



enlarged. 

 Fig. 234. Ova, highly magnified; 0.027 by 0.014 mm. 

 Fig. 235. Spines of body greatly enlarged; distance between rows of spines 



0.009 mm. 



Plate 28. 



Aspidogaster ringens Linton, from Calamus calamus. 



Fig. 236. Ventral view, somewhat diagrammatic, life, details added; length 



1. 5 1 mm. There did not appear to be any longitudinal, median 



ventral ridge. /, marginal sense-organs; h, transverse ridges; 



k, marginal loculi. 

 Fig. 237. Ventral view of left margin. Coarse stippling represents nuclei of 



cells. Reference letters as in 236. 

 Fig. 237a. Right margin near anterior end, ventral view. Reference letters 



as in 236. 



Udonella socialis sp. nov. on Argulus sp. in mouth of Neomainis griseus. 



Fig. 238. Dorsal view of adult, balsam; length 1.20 mm. e, ovum in uterus; 



q, q, volk-reservoirs (?). 

 Fig. 239. Ventral view of head, life; diameter of head 0.27 mm. w, mouth. 

 Fig. 240. Lateral view of head of small specimen, balsam. 

 Fig 241. Posterior end of Argulus with trematodes, young and adult, and 



ova attached. Sketch made from specimen mounted in balsam. 



ad, adult; j, egg from which a young trematode is in act of 



escaping; k, egg-capsule from which the young has escaped; 



/, part of egg-chain of copepod; y, young. 



