PLATE II. 



Sagitta pulchra Doncaster. 



Fig. 49. — The entire animal. 



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



with some tactile papillae. ■ 25. 



Fig- 5 1 — A jaw. 71. 



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



Fig- 53- — The vestibular ridge, 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 entire 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. ■ 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. X 20. 



Fig. 61. — A jaw. X 92. 



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



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



Fig. 64. — The vestibular ridge, 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. X 287. 



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



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



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



Sagitta Zetesios Fowler. 



Fig- 73 



The entire animal, 30 mm. in length. 



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



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



Fig. 76. — A Jaw. ■ 71. 



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



Fig. 78. — The posterior teeth, boiled out, from a contracted specimen. Of the first tooth only the tip 



is seen. X 105. 



Fig. 79. — Vestibular ridge and posterior teeth, dorsal view. 105. 



Krohnia hamata Mobius. 



Fig. 80. — a. and b. old and young hooks from the same specimen, 287. c. young hook from another 

 specimen. 247. 



