278 BUI^LETIN OF THE BUREAU OF FISHERIES. 



described by Hoyle in 1904. The order of length of the arms is 3, 4, 2, i; the siphon extends almost to 

 the margin of the umbrella; the ventral region of the body is prominently ridged, giving it a very 

 characteristic shape, and the funnel organ, although agreeing in the /\-like form, seems very dissimilar 

 in detail. 



4. Bolilcuna microcotyla "Steenstrup" Hoyle, originally noted from the Atlantic, but also obtained 

 by the Albatross from the region of the Galapagos Islands. This species diflfers in numerous particu- 

 lars. It is brownish purple in color, the relation of the head to the body is more intimate, the arms 

 are not so long, their suckers smaller, the umbrella more extensive, the funnel organ W-shaped besides 

 appearing different in structure, and the gills are stated to have but six lamellae. Furthermore, in 

 E. Iieathi the latter are much longer and larger, and the siphon does not appear to possess any ligaments 

 uniting it on either side with their apices. 



OiU" species more resembles some figures of " Bolitana {Eledonella) n. sp.," given by Chun, but 

 not exactly, and a diagnosis of the latter has not yet been published. 



It is with much pleasure that I have associated the name of my friend Dr. Harold Heath, of Stan- 

 ford University, with this interesting form. 



Genus POLYPUS Schneider, 1784. 



Po/j-^uj Schneider, 17S4, p. 116. 

 Octo^M^ Lamarck, 1799, p. 18. 



Hoyle, 18S6. p. 74. 

 Polypus Hoyle, 1901, p. 1-5. 



Body more or less rounded and compact, variously colored and ornamented, a marginal membrane 

 sometimes present, but no fins. Branchial cavity separated into two chambers by a median septum. 

 Mantle connectives poorly developed, consisting only of shallow folds or grooves. 



Arms variable, usually provided with a more or less extensive umbrella. Suckers in two rows 

 except at the extreme base. Hectocotylus confined to the tip of the third arm on the right side. 



Polypus is by all odds the largest, most cosmopolitan, and one of the most puzzling genera of 

 living cephalopods. Within it are included most of the common shore devilfishes of almost ever)' coast. 



Type, Octopus vulgaris Lamarck, a generally distributed species in European waters. 



Polypus bimaculatus (Verrill, 1883). (PI. xxxiv; pi. xxxv, fig. 2; pi. xxxix, fig. 5.) 



Octopus bimaculatus Verrill, 1883a, p. 121. pi. v, fig. i-ia, pi. vi. 



Hoyle, 1886, p. 8 (no description). 



Hoyle, 1886a. p. 217 (13), (no description). 



Brock, 1887, p. 610, 611. 

 Polypus bimaculatus Hoyle, 1904, p. 16 (mere note). 



Beiry 1911a, p. 301. 



Body pyriform, as long or longer than wide, truncate and broadest posteriorly. Siu-face orna- 

 mented with numerous warty papillae or tubercles nearly obsolete ventrally ; above varying from a nearly 

 smooth state where only the largest cirri can be made out, to the extremely rugose condition figured by 

 Verrill, where the tubercles become unusually pronounced both in size and numbers. A large promi- 

 nent conical warted cirrus, often accompanied by one or two other much smaller ones, appears just over 

 each eye, persisting in all the specimens seen. 



Head not very large, separated from the body by a slight constriction. Eyes moderately large. 

 Funnel conical and rather long; free for much of its length. 



Arms fairly stout, three to four times as long as the body, unequal, the dorsal and ventral pairs usu- 

 ally the shortest; extremities attenuate. Umbrella well developed, especially between the lateral arms; 

 somewhat shorter between the dorsal, andordinarily shortest of all between the ventral arms; continuing 

 as a narrow, not very prominent web along the outer surface of each arm to its tip, although not always 

 readily traceable so far. The outer surface of the web and arms is tuberculated in the same fashion as 

 the body but in somewhat less degree. Hectocotylus of the male (pi. xxxv, fig. 2) excessively minute, 

 involving only the extreme tip of the third right arm; marginal groove terminating in a small, much 



