78 Sitst Annual Report 
Doris sp. 
(Figure 38 C) 
Mantle brown, bordered with yellow, and covered with small white 
tubercles more thickly in the center than on the edges. Foot yellow, 
branchie light yellow. The branchie and rhinophores are retractile 
into smooth bordered sheaths. Body deep, with the dorsum highly 
arched. Tentacles rudimentary. Length 27 mm. Common under 
stones during July and August but rare in September. 
Cuthonia sp. 
(Figure 39 H) 
Color translucent whitish. Cerata translucent with a dark green 
core. A dark green spot in front of the rhinophores. Length 5 mm. 
Cutting edge of mandible strongly denticulate. Radula consisting of a single row of 
plates. There are usually nine teeth on a plate, the central one not prominent, as short or 
shorter than the prominent laterals. 
Hervia sp.? 
(Figure 39 I) 
Color translucent whitish. Rhinophores orange, and with an 
orange spot in front of them. Cerata with greenish-black cores, and 
tipped with orange. Animal very slender, the body highest in the 
region of the rhinophores. Rhinophores and tentacles slender and 
non-retractile. Length 7 mm. 
Cutting edge of mandible not toothed, strongly striated. Radula consisting of a single 
row of plates. Usually eleven teeth on a plate, the central not prominent, the laterals long 
and slender. 
Hermissenda opalescens (Cooper). 
(Figure 39 J) 
Color translucent whitish, with light brown stripes on tentacles 
and tail. Orange markings occur on the head. Cerata translucent, 
with brown cores and orange markings. Animal very slender. Cerata 
numerous and very easily detached. Anterior margin of foot pro- 
longed into two tentacle-like processes. Lips bilobed, the upper 
narrow, the lower large. Common during the early part of the sum- 
mer in tide-pools. 
Cutting edge of mandible with about thirty strong denticles. Radula consisting of a 
single series of angularly arched plates. The central tooth is large and finely denticulated 
on the lower edge; the laterals are small, three to four on a side. 
Spurilla sp. 
(Figure 39 K) 
Color white. Back and top of head orange with a finely granu- 
lated appearance. Cerata near head orange with brown cores, those 
farther back becoming browner. ‘Tentacles white. Rhinophores 
foliate, and red, with white tips. Animal slender, the foot large, 
anterior margin slightly prolonged into tentacle-like processes. 
Rhinophores and tentacles shghtly contractile. Mouth large, under 
lip bilobed, upper smooth. Cerata in constant motion and very easily 
detached. Common in September. Length 15 mm. 
Cutting edge of mandible not toothed, strongly striated. Radula consisting of a single 
series of low-arched, pectinate plates, notched in the center. 
