100 PROCEEDINdS OF THE NATIONAL MUSEUM. vol. xxxin. 



Dimensions in millimeters, life: Cyst, length 2.3, breadth 1.12; 

 length of embiyo 0.1. 

 Diplodus sargus. 



fFuly 14, two cysts inclosed in a inass of hrown secretion on the 

 serous coat of the viscera. 

 Ocf/irrus ch/y.si/ru.s. 



July 22, few, small, from cy.sts on mescntpry. 



OTOBOTHRIUM PENETRANS, new species. 

 Plate VI, tigs. 39-48. 



Olobothrlnm, species, Bull. Bureau of Fisheries for 1904, XXIV, p. .S57, ligs. 

 102-109. 



Type.— Cat No. 5798, U. S. N. M. 



Bothria marginal, widel}^ divergent, with pits characteristic of the 

 genus; neck somewhat elongated, at least longer than the head, stout, 

 widely flaring and emarginate at posterior end; contractile l)albs 

 curved, concave on lateral, convex on medial sides, approximate at 

 their anterior ends but strongly divergent at the posterior ends; pro- 

 boscides stout and of moderate length; hooks of man}^ ditferent sizes 

 and shapes, the larger ones strongly recurved with rather narrow, 

 unsymmetrical base. A few of the slender hooks near the base of the 

 proboscides are somewhat spirally crooked. 



Dimensions in millimeters of alcoholic specimen: Length of scolex 

 to base of bulbs 4; breadth of head 1.7.5. Another, in balsam: Head 

 compressed, length 1.12, breadth 1.95; approximate length of probos- 

 cides 1.8, diameter, including hooks 0.24, excluding hooks 0.15, length 

 of longest hooks 0.09. In another, length of contractile bulbs 1.35, 

 breadth 0.55; approximate length of proboscis 2.25. 



Blastocyst (plerocercus): Elongated, white, very irregular in shape; 

 one, somewhat contracted, measured 25 mm. in length. 



NOTES ON HABITAT. 



TylfmiiTvs acus. 



Blastocysts very numerous in the flesh of each of two gars, July 16. 

 These were generally distrilRited in the muscles of the back and sides, 

 but were most abundant along the dorsal region; a few were found in 

 the peritoneum. They were all relatively large, white, and very active, 

 even after they had been in sea water for several hours. 



TETRARHYNCHUS BISULCATUS Linton. 



Rhynchobothrium bimlcatuiit Linton, Report U. S. Fish Com. for 1886, pp. 479-486, 



pi. lY, figs. 9-23. 

 Tetrarhynchns hisulcatus Linton, Report U. S. Fish Com. for 1887, pp. 857-861, 



pi. XIV, figs. 10-12; pi. XV, fig: 1; Proc. U. S. Nat. Mus., XIX, pi. lxvi, figs. 



11-15; XX, pp. 452; Bull. U. S. Fish Com. for 1899, pp. 272 and 414, etc.; 



Bull. Bureau of Fisheries, XXIV, p. 383, etc. 



