428 



BULLETIN OF THE BUREAU OF FISHERIES. 



Gasterostomum graeilescens Eudolphi, from crevalle i Caranx hippos). (See Figs. 236-239.) 



Fig. 230. — Ventral view, life; actual length 1.17 mm. 

 Fig. 231. — Spines from body. > 540. 

 Fig. 232.— Pharynx, etc. X 315. 



Gasterostomum baculum, sp. now, from Spanish mackerel (Scomberomorus maculalus). 



Fig. 233. Dorsal view, life; actual length 2 mm. 

 Fig. 234.— Ventral view of another specimen, life. 



Gasterostomum arcuatum Linton, from cero {Scomberomorus regalis). 



'235. — Lateral view, life; actual length 4.2 mm. 



F] 



Fig 



PLATE XXXIII. 

 Gasterostomum graeilescens Rudolphi. 

 236.— From silverside (Menidiu menidia), encysted. (See Figs. 230-232.) 



Cysl filled with 



Actual length of 



material that resembled small fat globules and an immature Gasterostomum. 



cyst 1.5 mm. i, Rudiment of intestine. 

 Fig. 2:57. —From flounder {Paralichthys albiguttus); dorsal view. Life; actual length 1.2S mm. 

 I'n,. 23S. — From toad-fish [Opsanus tau). Immature specimen. Life; actual length 0.9 mm. 

 Fig. 230. — Another specimen from same lot. 



Gasterostomum gorgon, sp. qov., from amber jack {Seriola lalandi). 



I'n,. 240. — Sketch of specimen killed in formalin, tentacles extended. Actual length 1.65 mm., diam- 

 eter of neck 0.21 mm. 



I'n.. 241.— Another specimen from same lot, with tentacles retracted, the most usual condition in the 

 preserved specimens. Sketch made from specimen in balsam, somewhat diagrammatic. Actual 

 length 0.0 mm. 



Fig. 242. — Ova of same. Length of ovum 0.022 mm. 



PLATE XXXIV. 

 Aspidogaster ringens, sp. nov., from croaker (Micropogon undulatus). 



Fig. 243.— Lateral view. Actual length about 2 mm. There is great variation in this species with 

 different states of contraction; fur example, the head may be retracted, or head and tail both 

 retracted until the body proper is shorter than the ventral sucker. 



Fig. 244. — Dorsal view of a specimen the actual length of which was 1.5 mm., life. 



Flo. 245. — Dorsal view of living specimen, compressed. X 50. 



Fig. 240. — Ventral view of alcoholic specimen. Actual length l.S mm. 



Fig. 247.— Ventral view of head and neck of living specimen, ventral sucker omitted. X 50. 



Imi,. 24s. Lateral view of posterior end of body of.living specimen. • 50. The position of the testis 

 and ovary is variable. In some cases they lie near the middle of the length of the body. 



Fn;. 240. — Front view of head, alcoholic specimen. 



EXPLANATION OF LETTERS ON PLATES. 



bl blastocyst . 



c cirrus. 



cp cirrus pouch. 



nf cyst. 



ex excretory vessel. 



g genital aperture. 



i intestine. 



id diverticulum of intestine. 



l t lemniscus. 



la larva. 



in mouth. 



a ovary. 



od diverticulum of oesophagus 



tr oesophagus. 



pit pharynx. 



pr prostata gland. 



sr seminal receptacle. 



sr seminal vesicle. 



t testis. 



u uterus. 



r vagina. 



ni vas deferens. 



V g vitelline gland. 



ni vitelline duel. 



