Fam. 1, Plate 16. 



Bigs. 1, 2,3. 

 DORIS 3UBQUADRATA, Alder and Hancock. 



D. crassa, alba, subpellucida ; pallio parvo, subquadrato, caput et pedem haud tegente, papillis 

 parvis ; tentaculis crassis, vaginis laevibus ; branchiis 7, magnis, bipinnatis, repandis, non retractilibus ; 

 pede crasso. 



Doris subquadrata, Aid. and Hanc, in Ann. Nat. Hist., v. 16, p. 313. 



Hab. In deepisb water, Torbay, /. A. 



Body nearly an inch long, rather elevated, white, with a slight yellowish tinge, semi- 

 transparent. Cloak small, scarcely covering the head when the animal is extended, and 

 exposing the foot behind. It is somewhat squared before and behind, and has the edge 

 mostly a little elevated ; it is not very convex, and is thinly covered with smallish, unequal 

 conical papilla?, which become larger towards the sides. Dorsal tentacles stout and subclavate, 

 with twelve or fourteen laminae scarcely reaching behind. They issue from very short 

 sheaths with smooth edges. Branchial plumes seven, non-retractile, bipinnate ; the anterior 

 and lateral ones large and spreading ; the posterior small, with an additional branch on the 

 inside. The plumes have each a very strong midrib, which is attached for nearly half its 

 length to the cloak, leaving only the ends and sides of the plumes free. These ribs expand 

 very much at the base, and become confluent with the central area surrounding the anus. 

 The plumes are of a transparent yellowish white, and have an opaque white line on each 

 side of the midrib, as in Boris pilosa, but less conspicuous : the whole forms an irregular star 

 longest in the transverse diameter. Head furnished with a semicircular veil, produced into 

 rounded obtuse angles at the sides. Foot very large and thick, rather rounded in front, and 

 extending to a blunt point considerably beyond the cloak behind. The sides are high, and 

 there is a slight ridge from the posterior part of the cloak to the tail. 



We have met with only one example of this interesting Doris. It was dredged near 

 Berry Head, Torbay, in May, 1845, and, unfortunately, did not live very long after its 

 capture, so that its habits remain unobserved. From the softness of the cloak we conclude 

 that it contained very few spicula, but we were unwilling to cut up our single specimen to 

 ascertain their character. 



This Doris, which is closely related to B. joilosa, forms,- from the smallness of its cloak, a 

 connecting link between this genus and Goniodoris. 



