316 ALLEN: NEW ENGLAND WHALEBONE WHALES. 



living species of the genus Coronula. Pilsbry, in his monograph just issued, has extended 

 our knowledge of these, and has established the fact that two species occur as parasites or 

 commensals on the Atlantic Humpback. Of these C. diadema is the most common, and is 

 found only slightly imbedded in the whale's skin, particularly on the front edge of the pec- 

 toral flipper, about the anus and flukes. It is known from the North Pacific as well as from 

 the North Atlantic, but not as yet from the South Atlantic. The second species, C. reginae, 

 has a similar range, so far as known. It is found on the lips of the Humpback, where the 

 skin is thin, and here its more flattened shell grows deeply imbedded, so that only the sum- 

 mit is seen. Van Beneden (1890) recorded it from the Gulf of St. Lawrence. The third 

 species, C. complanuta, is somewhat like the last. Its only North Atlantic record seems to 

 be that of Pilsbry, based on a specimen in the Paris Museum, from Norway. 



Attached to the large Coronulae, are often to be found clusters of a second species of bar- 

 nacle, the long-stalked Conchoderma aurilum. This species is cosmopolitan, and is not usually 

 attached to the Humpback except in this secondary way. 



A third species of crustacean, the whale-louse, an aberrant amphipod, is also found cling- 

 ing by its hook-like legs, to the rugosities or between the throat plaits of this whale. It is 

 considered to represent a genus distinct from that found on the North Atlantic Right Whale, 

 and is known as Paracyamus boopis (Liitken). An outline figure of this species, taken from 

 Liitken's paper, is here shown (text-fig. 12). According to Morch (1911) the curious crusta- 

 cean Penella is occasionally found attached to the Humpback. No doubt also the small para- 

 sitic copepod Balaenophilus will be found attached to the baleen plates, but I know of no record 

 for it in this species. The internal parasites likewise remain quite unknown, though one or 

 more species of cestodes doubtless are present in the intestinal tract. 



