122 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



Steenstrup and Liitken^ said that if it should prove that several 

 closely related species had been combined under the single name 

 filosa, the species from the Mediterranean swordfish must be consid- 

 ered as the type, which is obviously true. But these authors at- 

 tempted no further identification of the species. 



No other investigator did more than to mention the species until 

 Brian in the Bulletin de I'lnstitut Oceanographique (No. 110, 1908, 

 p. 8) described at considerable length and illustrated with text figures 

 both the development stages and the adult female. In this paper ho 

 placed a question mark after the species, but in a subsequent paper * 

 he dropped the question mark and was satisfied with the identity of 

 the species. His specimens were obtained from Orthagoriscus mola 

 in the Atlantic west of the Azores. The present author has found 

 both adults and development stages of the same parasite upon the 

 swordfish. 



Finally Quidor ^ has given us photographs of the entire animal and 

 careful drawings of the plumose appendages of the abdomen from 

 which we can easily identify the species. His specimens were found 

 both on the swordfish and the sunfish on the northern coast of 

 France. 



With the details here added in reference to the antennae, the chitin 

 framework supporting the esophagus, and the mouth parts of the 

 development stages this species ought to be securely established. 



PENNELLA INSTRUCTA, new species. 



Plate 18, figs 141-147. 



Host and record of specimens. — The United States National Mu- 

 seum collection includes the following specimens, all taken from the 

 swordfish, Xiphias gladius: No. 3691, two females, by steamer Look- 

 out from Atlantic off New England; No. 6159, one female, by the 

 fisheries steamer Albatross., northern Atlantic; No. 14574, one female, 

 from Maine coast ; No. 47750, a single female with the cyst which en- 

 closed its head and neck, from Woods Hole, Massachusetts, made the 

 type of the species; No. 47751, eight females with their cysts, from 

 Woods Hole; No. 47752, five females, from Woods Hole; No. 47753, 

 four heads with horns intact, taken from cysts found inside the body 

 of a swordfish, Woods Hole. 



Specific characters of female. — Cephalothorax swollen, consider- 

 ably longer than wide and squarely truncated anteriorly, with the 

 lateral walls slightly concave. This hollowing in of the sides of 

 the head is due to large swellings at the bases of the horns posteri- 



iKong, Danske Videns, Salskabs, Skrifter, 18G1, vol. 5, p. 416. 

 * Campagnes scientifiquos clue Prince de Monaco, fasc. 38, 1912, p. 10. 

 » Dcuxi&me Expedition Antarctiaue Francaise, Charcot, 1912, pi. 1, flgs. 5-8 ; pi. 4, 

 figs. 35, 3G. 



