26 A. E. Verrill — Additions to the Fauna of the Bermudas. 



tudinally grooved. Length to breadth as 3 : 2. Length, 60 mm ; 

 breadth, 40 mm . 



No mantle-pore could be found, nor any distinct pore for the 

 "opaline gland"; the latter probably discharges through many 

 minute pores. 



A single specimen was found in Castle Harbor, March 21, cast 

 upon the beach but still living and not damaged. (A. H. V.) 



This species resembles T. megaptera V., in the great size of its 

 lateral flaps, but differs very decidedly in its colors and other char- 

 acters. 



Tethys ( Aplysia) tarda V. , sp. nov. 



Plate III. Figures 4, 4«, 4fr. 



A rather small, short, thick species, with relatively narrow side- 

 flaps and short rhinophores ; dusky yellowish brown, irregularly 

 streaked with darker brown or blackish on the head and sides. 



Body ovate, obtuse posteriorly, the foot not produced. Head 

 small, emarginate ; neck short and thick. Rhinophores short, sub- 

 conical, tapered. Tentacles larger and rather longer, wide at base, 

 deeply folded. Side-flaps unusually narrow, scarcely meeting over 

 the back, and apparently not capable of being used for swimming, 

 the edges undulated and free to the posterior ends, which extend 

 nearly to the short tip of the foot. Branchial siphon elongated, 

 expanded distally. Mantle over shell with a small, simple, nearly 

 central pore, often with white streaks, or rows of white spots, radi- 

 ating from it. 



General color usually is dark dusky brown or umber-brown. The 

 ground-color is a dull, dark yellowish brown on the sides and head, 

 but irregularly blotched, striped and streaked with dark, dusky 

 brown or sepia. The streaks on the head mostly take the form of 

 narrow lines, those on the sides of the body are broader and more 

 irregular, and are united by transverse lines, so as to form a coarse, 

 irregular reticulation. Edges of side-flaps and siphon bluish gray 

 with a purplish tinge, or grayish white. Inner surface of flaps dark 

 brown with dark gray blotches. Shell-mantle dark brown, irregularly 

 spotted with grayish white, some of the spots usually arranged 

 radially around the central pore. Siphon similar in color. Tenta- 

 cles and rhinophores light brown, with transverse patches or lines of 

 dark brown. 



Length, in life, 62 mm ; height, 30 mm . 



The shell is thin, translucent, pale yellow, ovate-elliptical, rather 

 narrow, ratios as 3.2 : 2 ; the posterior end is produced, with the 



