126 WIIITEAVES ON MARINE 1NVERTEBBATA, ETC., 



concentric lines of growth. Central areas of all the valves but the anterior one 

 regularly pitted, as viewed by an ordinary simple lens of moderate power, the 

 pitting being most distinct near the suture. These pits are the interstices between 

 longitudinal, lightly curved and convergent raised lines, and the curved raised 

 lines of growth. Lateral areas of the valves (exclusive of the anterior one) not so 

 distinctly pitted, but more or less marked with faint radiating striae, especially 

 those of the anterior portion of the shell ; those of the third to the seventh, both 

 inclusive, each bearing from four to six distant, isolated, prominent and rounded 

 tubercles on each side, three being usually placed on each of the lines which 

 separate the lateral from the central areas. 



Length of the only specimen collected, about fourteen millimetres ; maximum 

 breadth of the same, six and a half. 



Discovery Passage at station No. 7, one living specimen. 



An interesting and beautiful little species, apparently well characterized by 

 the peculiarly punctate surface of the central area of the valves. 



TONICELLA LINEATA, Wood. (Sp.) Frequent, living, at low water, on the north shore of 

 the Strait of Georgia, in Malaspina Inlet, Discovery Passage, Race Passage in 

 Johnstone Strait, Queen Charlotte Sound, and on the north and north-west coast 

 of Vancouver Island, from Nahwitti Bar to Quatsino Sound. Taken abundantly 

 from the stomach of a harlequin duck (Histrionicus torquatus) shot at Mittlenatch 

 Island, in the Strait of Georgia. Dredged also in Queen Charlotte Sound at station 

 No. 12. 



/ ISCHNOCHITON INTERSTINCTTJS, Gould. (Sp.) Low tide in Eace Passage Johnstone Strait, 

 and in Queen Charlotte Sound, but apparently not common. More abundant in 

 Discovery Passage at station No. 1, in Johnstone Strait at station No. 10, in Queen 

 Charlotte Sound at stations Nos. 12, 14, 15 and 16, and in Quatsino Sound at 

 station No. 20. 



ISCHNOBADSIA TBIFIDA, Carpenter. (Sp.) Queen Charlotte Sound, one large, living 

 specimen. 



LEPIDOPLEURTJS MERTENSII, Middendorf. (Sp.) Discovery Passage at station No. 7, two 

 living specimens; and Queen Charlotte Sound at station No. 15, one living 

 example. 



(COLLISELLA) PATINA, Eschscholtz . Abundant, living at low tide in Johnstone 

 Strait. 



(COLLISELLA) PELTA, Eschscholtz. Common and alive at low tide at the north end 

 of Texada Island, Strait of Georgia ; in Discovery Passage, between Seymour Nar- 

 rows and Elk Harbour ; in Johiistone Strait ; on the east side of Queen Charlotte 

 Sound ; and along the north and north-west coast of Vancouver Island, from Nah- 

 witti Bar to Quatsino Sound. Numerous but dead specimens were dredged in 

 Discovery Passage at station No. 7. 



(COLLISELLA) PERSONA, EschscMtz. Low tide in Discovery Passage, between 

 Seymour Narrows and Elk Harbour, four adult, living specimens. 



