42 MacFarland Preliminary Account of tyorididse. 



Monterey Bay ; not abundant but has been taken at all times of the year. 

 This species was discovered and described superficially by Cooper (1862) 

 and was afterwards studied anatomically by Bergh (1880) upon specimens 

 from Alaska which appear to be identical with the Monterey form. 

 No. 181,288, U. S. National Museum. From Monterey Bay, Calif. 



6. Aldisa sanguinea (Cooper). 



Doris (Asteronotus) sanguinea Cooper, New Species of Californian Mollusca. 



'Proc. Calif. Ac. Sci., II, 1862, 204. 

 Doris sanguined Cooper (Asteronotus), New or Rare Mollusca Inhabiting the 



Coast of California, No. II, ibid., Ill, 1863, 58. 

 Asteronolus? sanguineus (Cooper). Bergh, Malacologische Untersuchungen 



(Semper, Reisen im Archipel der Philippinen), II, XVII, 1890, 917. 



Body somewhat depressed, oval, the ends about equally rounded; dor- 

 sum covered everywhere with small conical tubercles, the general body- 

 color light to dark red, sprinkled everywhere with minute black spots ; on 

 the median line immediately in front of the branchiae a large rounded or 

 oval black spot, another similar spot in advance of the first just behind 

 the rhinophores. Foot abruptly rounded in front, less so behind, the 

 sides converging posteriorly, anterior margin bilabiate. 



Total length, up to 17 mm. ; width, to 8 mm. ; height, to 6 mm. 



Tentacles short, auriform, grooved externally ; rhinophores rather stout, 

 the clavus conical, perfoliate with 12 to 15 leaves, deeply retractile into 

 sheaths with low tuberculate margins ; branchial plumes 8 to 10, simply 

 pinnate or irregularly bipinnate, arranged in a circle, completely retractile 

 into sheath with low tuberculate margin ; oral cuticula thick ; on the sides 

 of the tube a delicate armature of extremely fine short rodlets; radula 

 rather wide, teeth in 70 rows; rhachis narrow, naked ; pleural teeth very 

 numerous and slender, at least 70 to 100 in each half row ; each tooth 

 made up of a triangular compressed base from which arises a slender rod- 

 like shaft, the distal end slightly enlarged and hollowed on posterior face, 

 on its thickened external and distal margin a single series of very small 

 denticulations which continue down the border of the shaft for varying 

 distances, in some cases occupying the distal half of the shaft; inner teeth 

 about .5 mm. in length, the outermost ranging down to .03 mm. 



Glans penis cylindrical, blunt, its cuticle with 5 or 6 rows of small re 

 curved hooks. 



This species was first described by Cooper (1862-63) as Doris sanguinea 

 in an exceedingly fragmentary manner. The form is abundant in Mon 

 terey Bay and a careful study shows that it does not belong to the genus 

 Asteronotus as given by Bergh ( 1892) but forms the second species of the 

 genus Aldisa, the other species of which, Aldi'sa zetlandica Alder and Han 

 cock, belongs to European waters. 



No. 181,277, U. S. National Museum. Monterey Bay, Calif. 



