PLATE II. 



Sagitta piilchra Doncaster. 



Fig. 49. — The cntire aiiimal. 



Fig. 50. — The anterior end, showing the corona cih'ata (sometimes a good deal longer), and collarette, 



with some tactile papillae. • 25. 



Fig- 51 — A jaw. / 71. 



Fig. 52. — The anterior and posterior teeth. y 140. 



Fig' 53- — The vestibular ridgc, from the ventral aspect. X 210. 



Fig. 54. — The posterior teeth and vestibular ridge. from the dorsal aspect. ■ 210. 



Sagitta regularis Aida. 



Fig. 55- — The cntire animal. 



Fig. 56. — The anterior end, showing corona, ganglion, collarette, and the beginning of the anterior fins. ■ 33. 



Fig. 57. — The two anterior and five posterior teeth in place, and part of the vestibular ridge; from the 



dorsal surface. X 430. 

 Fig. 58. — The vestibular ridge, from the ventral surface. > 430. 



Sagitta robusta Doncaster. 



Fig. 59. — The entire animal. 



Fig. 60. - — The anterior end with the corona, showing its extension towards the ganglion. • 20. 



Fig. 61. — A jaw. • 92. 



Fig. 62. — The teeth, boiled out. • 105. 



Fig. 63. — The posterior teeth in place and vestibular ridge: dorsal view. • 105. 



Fig. 64. — The vestibular ridgc, ventral view, with the first and last teeth. • 105. 



Sagitta serratodentata Krohn. 

 Fig. 65. — The entire animal. 



Sagitta Sibogae species nova. 



Fig. 66. — The entire animal. 



Fig. 67. — The head and neck showing the small collarette, and elongate eyes. The dotted outline of 



the corona ciliata is of doubtful accuracy. • 25. 



Fig. 68. — a. The first or most anterior (youngest), and b. the second, jaw. • 87. 



Fig. 69. — The tip of a jaw. y 2S7. 



Fig. 70. — The anterior teeth, boiled out. 105. 



Fig. 71. • — The posterior teeth, boiled out. • 105. 



Fig. 72. — The vestibular ridge from the ventral surface, showing the first and last tooth. ■ 25. 



Sagitta Zetcsios F o wier. 



Fig- 73- — The entire animal, 30 mm. in length. 



Fig. 74. — The entire animal, from an apparentlv uncontracted specimen. 



Fig- 75. — The entire animal from a strongly contracted specimen. 



Fig. 76. — A Jaw. / 71. 



Fig. -jj. — The anterior teeth, boiled out, from a contracted specimen. 105. 



l-"ig. 78. — The posterior teeth, boiled out, from a contracted specimen, üf the fust tooth onl)- the tip 



is seen. X 105. 



l'ig. 79. — Vestibular ridge and posterior teeth, dorsal view. 105. 



Krohnia hamata Mobius. 



Fig. 80. — (7. and /;. old and j-oung hooks from the same specimen, •; 287. c. young hook from another 

 specimen, y 247. 



