48 A MONOGRAPH OF THE 



Sub-Fam. Melibin;e. Tentacles 2, plain, retractile within sheaths. Branchiae clavate. 

 Anus latero-dorsal. 



Genus 12. DOTO, Oken. 



Body without cloak. Branchiae ovate, muricated, set in single series on each side. 

 Tentacles filiform, with short trumpet-shaped sheaths. Veil short and smooth. Fam. 3, PI. 4. 

 Tongue very narrow, consisting of a single plate with a large central spine and minute lateral 

 denticles. No jaws. 



1. D. fragilis, For. Uniform yellowish-brown or olive; branchiae robust, ovate- conical, without 



terminal spots, 7 to 9 on each side. Length 1 inch. PI. 5. 



2. D. pinnattfida, Mont. Yellowish or olive, spotted with brown and black ; veil arched ; branchiae 



ovate-conical, 7 to 9 on each side, the tubercles slender, each with a terminal black spot. 

 Length T 4 5 inch. PI. 45. 



3. D. coronata, Mull. Yellowish- white spotted with red; branchiae ovate or subclavate, 5 or 6 on 



each side, with a terminal purple spot on each tubercle. Length \ inch. PI. 6. 



Sub-Fam. Eolidin^:. Without cloak. Tentacles 4 or 2, non-retractile, without sheaths. 

 Branchiae simple, papillose. Anus lateral. Gastro-hepatic system with a posterior central 

 vessel. 



Genus 13. EOLIS, Cuvier. 



Tentacles 4, linear. Branchiae set in transverse rows along the sides of the back. Fam. 3, 

 Pis. 7 and 8. 



Tongue narrow, generally of a single plate. Corneous jaws. 



Section 1. Branchiae numerous, subcompressed and crowded; angles of the foot sharp. 

 Spawn of several undulating coils. Folis proper. 

 Lingual plate broad, uniformly pectinated. 



* 'Lingual plate a single arch. 



1. E. papillosa, Linn. Brown, gray, or orange, spotted with brown and white, ovate, sub depressed ; 



branchiae stout, set in 18 — 24 transverse rows ; head broad, usually with a triangular 

 mark; tentacles short; anterior angles of the foot rather short. Length li to 3 inches. 

 PI. 9. 

 ** Lingual plate a double arch. 



2. E. glauca, A. and H. Brick-red, subdepressed ; branchiae conical, vermicular, glaucous or olivaceous, 



spotted with brown and white, set in 14 rows ; tentacles smooth ; anterior angles of the 

 foot a little produced. Length If inch. PI. 11, and Appendix (19), p. vii. 



3. E. Alderi, Cocks. Grayish- white ; branchiae subcorneal, set in 12 to 14 rows, the first 2 or 3 



white, the rest gray marbled with brown, with yellow apices ; tentacles yellowish ; anterior 

 angles of the foot a little produced. Length T 7 5 inch. PI. 10, figs. 5, 6. 



Section 2. Branchiae clustered : angles of the foot produced. Flabellina. 



* Tentacles laminated. Spawn of many undulated coils. 



Lingual pjlate with a strong central spine and marginal denticles. 



