xvi A MONOGRAPH OF THE 



Section 2. With 2 posterior lateral gastro-hepatic vessels ; reproductive organs with 



2 external orifices. 



GEN. 



Fam. 13. FiONiDiE. Tentacles 4 simple; branchiae papillose, numerous; ") 



anus latero- dorsal; mouth with jaws . . j riona. 



Fam. 14. Herm.eid.e. Tentacles 2, dorsal ; branchiee papillose : anus I 



1 1 ^45. Stiliger. 

 dorsal; no iaws 



J ' L46. Alderia. 



Sub-Order — Pellibranchiata, A. and H. 

 Without special branchiae ; skin without spicula. 



< Tribe 1. Body limaciform. 



Fam. 15. Elysiad;e. Tentacles 2 or 4; body furnished with 2 lateral ~1 



expansions or folds ; gastro-hepatic system, much branched; ^ 47 ' Placobranclms - 

 anus latero-dorsal, in front of the heart; no jaws . J -^lysia. 



Fam. 16. Limapontiadje. Tentacles 2, or wanting ; back without appen- *) 49. Acteonia. 



dages; anus dorsal, posterior; no jaws . . j 50. Limapontia. 



Tribe 2. Body cylindrical or compressed. 

 Fam. 17. Phyllirrhoid;e. Tentacles 2, dorsal, linear, retractile; head "i 



distinct; tail compressed; mouth with jaws ; anus lateral j 51, Ph y llirrmoe - 



SYNOPSIS OE THE GENEEA. 



Sub-Order— Acanthobranchiata. 

 Fam. 1. Dorididcs. 



TYPE. 



Gen. 1. Doris, Linn. Body depressed; cloak covering the head and foot; 

 branchiae united at the base and retractile within a cavity; 

 dorsal tentacles laminated ; with oral tentacles. Tongue broad, 

 with numerous spines in each row 



a. Dorsal tentacles conical; oral tentacles tubercular; cloak 

 with hard spiculose tubercles. Lingual spines simple, 



uniform ; no central spine . . . d. tuberculata, Cuv. 



b. Dorsal tentacles conical ; oral tentacles tubercular ; cloak 

 with soft tubercles. Lingual spines long, linear, obtuse, 



denticulated ; no central spine . . ]). Zetlandica A & H 



c. Dorsal tentacles clavate; oral tentacles linear. Lingual 



spines of two forms; no central spine . . D. Johnstoni, A. & H. 



