BIOLOGICAL SURVEY OP WOODS HOLE AND VICINITY. 



561 



f Dipurella clavata Hargitt. a 



Hargitt, 1902, p. 19 (sp. nov.); Hargitt, 1904, p. 

 31; Mayer, 1910, p. 76 (Slabberia strangulata, 

 immature). 



A single specimen taken in Great Harbor, 

 August 16, 1902. 



Ectoplcura ochracea Agassiz. 



L. Agassiz, 1862, p. 343; A. Agassiz, 1865, p. 

 191 ; Verrill and Smith, 1873, p. 735, 455; 

 Fewkes, 1882, p. 295; Nutting, 1901, p. 373; 

 Hargitt, 19023, p. 554; Hargitt, 1904, p. 32; 

 Mayer, 1910, p. 69 (Ectoplcura dumortieri}. 

 Buzzards Bay, at Naushon Island. A. Agassiz. 

 Newport; Woods Hole. Nutting. Woods 

 Hole and vicinity, "taken mostly in the 

 evening tow." Hargitt. A common species 

 locally, occurring from June to September. 



Ectopleura prolifica Hargitt. 



Hargitt, 1908, p. 106 (sp. nov.). 



Described by Hargitt from a specimen found 

 upon a small spider crab, dredged off Gay 

 Head, July 15, 1907. Taken several times 

 during summer of 1908, and in considerable 

 numbers, both in Vineyard Sound and on the 

 piles of the Bureau of Fisheries pier at Woods 

 Hole. 



Hydrichthys mirus Fewkes. 



Fewkes, 1888, p. 224 (sp. nov.); Nutting, 1901, 

 p. 374; Hargitt, 1904, p. 32; Mayer, 1910, p. 

 67. 



A large cluster found growing upon the side of a 

 pilot-fish (Seriola zonata) taken at Newport in 

 August, 1887; not observed at any other 

 time. Fewkes thought it likely that this 

 hydroid was a parasite. Thousands of me- 

 dusae were liberated while the animals were 

 under observation. 



Family PENNARIID^. 



Pennaria tiarella McCrady. [Chart 14.] 

 A. Agassiz, 1865, p. 187; Verrill and Smith, 

 l8 73. P- 735. 3 2 7; Bumpus, iSgSb, p. 858; 

 Hargitt, 1900, p. 387-406; Nutting, 1901, p. 

 337. 374! Hargitt, 1901, p. 311; 19023, p. 554; 

 1904, p. 32; Mayer, 1910, p. 25. 

 Dredged by the survey throughout the length 

 of Vineyard Sound, at depths of i to 15 fathoms 

 on non-muddy bottoms; recorded but twice 

 in the Buzzards Bay dredgings, though 

 probably of more general occurrence as a 



Pennaria tiarella Continued. 



littoral species. Pennaria has a wide range 

 of habitat. It is perhaps most readily col- 

 lected from piles, but is found upon all sorts 

 of objects whether fixed or free. In mid- 

 summer it occurs in abundance on floating 

 eel grass. Dr. Hargitt believes that the 

 attachment to eel grass represents a later 

 seasonal phase in the life of Pennaria, and 

 that it is to be regarded as an adaptation for 

 distribution. The medusae are especially 

 abundant in the latter part of the summer. 



Fish Hawk stations: 7521 bis (? many), 7523 bis 

 (? few colonies), 7524 (many)f, 7525 (abun- 

 dant, large bunches), 7525 bis (? many), 

 7526 (many), 7531 bis*, 7537, 7540 (dead), 

 7542 (numerous), 7553 bis*, 7557, 7572 (many), 

 7582, 7589 (small tuft), 7594 (small piece, 

 dead), 7676 (sexually mature)*, 7681*, 7688*, 

 773*. 779*. 77i7*. 7718*, 7721*, 7725*. 7726*. 

 7730*. 7733*. 774i*. 7742*, 7743*. 7745*, 

 7746*, 7749*, 7751*, 7758*, 7759*, 7760*, 7761*, 

 77 6 3*> 7764*. 7779*- Supplementary stations 

 (1909): 7653, 7659. 



Phalarope and Blue Wing stations: i*, 30*, 44*, 

 51*, 63*, 71*, 73*, in*, 121*. 



Euphysa virgulata Agassiz. 

 Nutting, 1901, p. 370; Hargitt, 1904, p. 33; 



Mayer, 1910, p. 35 (Steenstrupia virgulata 



" = (?) 5. auraia Forbes"). 

 Woods Hole. Hargitt. 



Family HYBOCODONID^E. 



Hybocodon prolifer Agassiz. 



Verrill and Smith, 1873, p. 736, 328; Nutting, 

 1901, p. 341, 370; Hargitt, 19023, p. 552; Har- 

 gitt, 1904, p. 33; Mayer, 1910, p. 38. 



Vineyard Sound. Verrill. Woods Hole (medu- 

 sae only). Nutting. The medusas of this 

 species have been taken locally by Mr. 

 Edwards during nearly every month of the 

 year, but they appear from his records to be 

 most abundant in April. Dr. Mayer found 

 them in abundance in Woods Hole Harbor on 

 March 4 (1907), while Dr. Hargitt records their 

 capture off Crab Ledge in July and August. 

 So far as we know the polyp phase has not 

 been definitely recorded for local waters, but 

 the constant occurrence of the medusa war- 

 rants the belief that the hydroid likewise 

 occurs. 



a Dr. Hargitt now regards this as probably the medusa of Corynitis linvillei Hargitt. 



