MacFarland Preliminary Account of Dorididte. 49 



The fragmentary description of Stearns (1873) is based entirely upon ex 

 ternal features but is amply sufficient to render certain the indentification 

 of living specimens, especially as they are taken from the same locality as 

 that from which Stearns secured his original specimens. The structure of 

 the radula shows that it is distinct from T. modesta Bergh, with which it 

 has been united by the latter author in his paper upon Alaskan Nudi- 

 branchs. 



No. 181,291, U. S. National Museum. Monterey Bay, Calif. 



14. Triopha maculata sp. nov. 



Type from Monterey Bay, Calif. No. 181,276, U. S. National Museum. 



Body limaciform, the back passing insensibly into the sides save for the 

 line of processes which indicate the boundary. Sides slightly compressed, 

 foot linear, bluntly rounded in front, less so behind ; head flattened, slop 

 ing to the wide semicircular frontal margin which bears a fringe of from 10 

 to 12 short stout processes, each branching at its distal end into several 

 blunt or knob-like divisions each of which may be branched in turn ; dorso- 

 lateral margin with a similar series of 4 to 6 short branched processes con 

 tinuous forward into the frontal marginal series ; tail rapidly sloping from 

 branchial region, highly arched ; color of dorsum and sides yellowish 

 brown, varying from light to dark, thickly set everywhere with small 

 bluish white oval spots each forming the center of a very low polygonal 

 eminence bounded by very narrow orange yellow lines upon the dark 

 brown background ; foot below orange-yellow shading off above on the 

 sides into the deeper brown of the dorsum ; frontal and dorso-lateral pro 

 cesses and tips of branchiae, margin of rhinophore sheaths and clavus 

 bright orange-red or vermillion ; oral tentacles auriform, deeply grooved on 

 upper side, truncate ; rhinophores stout, perfoliate with about 18 leaves, 

 retractile into high sheaths with smooth or slightly crenulate margins; 

 branchiae 5, tripinnate, low, wide spreading; mandibular plates dark yellow, 

 triangular, made up of short flexible blunt rodlets ; radula broad, deeply 

 grooved, light yellow ; teeth in 14 rows ; rachis broad with 4 series of flat 

 tened plates, the 2 innermost rows being quadrangular in shape, the ante 

 rior margin smooth, thickened, the 2 outer rows flattened, triangular, the 

 central region more or less thickened and the lower inner angle occasion 

 ally prolonged into a slight cusp; pleurae 4 or 5, large, strongly hooked, of 

 nearly the same size and shape ; uncini 7 or 8, the first ones slightly pris 

 matic in form gradually becoming reduced to flattened plates; a well de 

 veloped slightly oblique crest directed toward the median line is borne by 

 all except the outermost two or three uncini. Glans penis armed with 

 thickly set hooks. 



Measurements of the longest specimen taken : length, 22 mm.; width, 10 

 mm.; extreme height, 11 mm. 



Abundant in tide-pools all along the coast of Monterey Bay. 



