54 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



3. Pectinate setae with relatively numerous fine teeth .... 4 



4. Anterior hooded hooks with main tooth nearly at right angles to 

 shaft (pi. 1, fig. 15) ; papillations of occipital tentacles consist 

 of irregular rows of a single kind ; main tooth of subacicular 

 hooks more strongly prolonged and turned up (pi. 1, fig. 19) 

 D. ornata, p. 55 



4. Anterior hooded hooks with main tooth distinctly oblique to the 

 main shaft (pi. 1, fig. 11); papillations of occipital tentacles 

 consist of a row of larger papillae separated by 2 or 3 rows of 

 minute papillae; main tooth of subacicular hooks not so pro- 

 longed and not turned up (pi. 1, fig. 10) . D. cuprea, p. 54 



Diopatra cuprea (Bosc) 

 Plate 1, Figs. 9-14 



Nereis cuprea Bosc, 1802, pp. 143-144. (The 4 figures here cited were 



not published until 1830, in a second edition.) 

 Wilson, 1882, pp. 288-291, pi. 21, figs. 89-92, pi. 23, fig. 10. 

 D. spiribranchis Augener, 1906, pp. 145-148, pi. 5, figs. 88-96. 



Collections. — A 7-39 (1) ; A 53-39 (5) ; Beaufort, North Carolina, 

 and Lemon Bay, Florida (numerous). 



The styles of the occipital tentacles are covered over with a charac- 

 teristic papillated pattern, consisting of 16 to 18 sets of longitudinal rows 

 of larger and smaller papillae (counted near the base of the style) ; each 

 set includes a row of larger, clear papillae and 2 or 3 intercalary rows of 

 much finer, dark specks. Seen on edge, in profile, only the larger, clear 

 areas are seen as minute elevations. This condition contrasts with that in 

 D. ornata, where the papillae are set in close, irregular rows, and are all 

 of one kind. 



Anterior parapodia are well developed, with long, triangular dorsal 

 and ventral cirri and postsetal lobe. The presetal lobe is characteristically 

 oblique. Dorsal cirri usually have diffuse pigment spots (pi. 1, fig. 13). 



Hooded hooks in the first few parapodia are distally bidentate, the 

 distal tooth strongly oblique and the accessory tooth directed more or less 

 parallel to the main tooth (pi. 1, fig. 11) ; it differs from that in D. 

 ornata, where the distal tooth is about at right angles to the main shaft. 

 A second parapodium has 6 or 7 of these hooks, of varying sizes (pi. 1, 

 figs. 11, 14). Limbate setae are long, slender, with very narrow wing, 

 the cutting edge smooth or nearly so (pi. 1, fig. 9). Pectinate setae num- 

 ber 9 to 12 in a fascicle, are distally somewhat oblique, and have 20 to 25 

 dentations (pi. 1, fig. 12). Subacicular hooks are bidentate (pi. 1, fig. 

 10). 



