208 [May, 



a line long, lateral, or subterminal, or transversely projected, furnished with 12 

 transverse rows of strong booklets, 6 in each row, alternating ; neck short. Male 

 without copulatory appendage. 



Body from 2 lines to 1 inch in length ; breadth anteriorly from 1 to 3-5ths of a 

 line ; breadth posteriorly from l-5th to 2-5ths of a line. 



Hab. Seventy-six individuals were found within the intestine, and according 

 to Prof. Baird, from whom they were received, also attached to the integument 

 upon the exterior of the body, of Salmo fontinalis. 



Remark. Closely allied to E. anguslatus, Rtid. 



10. EcHiNORHYNCHUs PROTEUS. Westrumb, De Helm. Acanth. p. 37 ; Duj. 

 Hist. Nat. des Helminthes, p. 529. 



Body orange color, fusiform ; anteriorly slightly spherically dilated ; posteri- 

 orly obtusely rounded. Proboscis cylindrical, with twelve to twenty transverse 

 rows of booklets, transversely projected, yellow. Neck long, posterior three- 

 fourths filiform, anterior fourth dilated into a spherical vesicle. 



Length of body 3 to 6 lines ; neck 2 to 3 lines long, l-6th line broad posteriorly. 



Hab. Found very frequently in the large intestine, often in great numbers, 

 of Labrax lineatus. 



Thelastoma, Leidy. 



11. Thelastoma brevicaudatum, n. s. Body white, cylindrical, anterior to 

 commencement of ventriculus rapidly narrowed, conoidal ; posteriorly abruptly 

 rounded, with a very short spiculate tail. Generative aperture just posterior to 

 middle. Anus just anterior to posterior rounded termination. Ventriculus 

 broadly dilated at commencement, and moderately so at termination. 



Length of body li to 2 lines ; anterior to ventriculus l-50th inch ; from anus 

 to end of tail l-200th in. ; tail l-2S5th in. long; breadth of body just above anus 

 l-133din.; at middle l-80th in.; at commencement of veatriculus l-75th in.; 

 cylindrical portion of oesophagus l-66th in. long by l-666lh in. broad; pyriform 

 portion l-250th in. long by l-285th in. broad. Ovum semi-oval, l-285th in. long 

 by 1.1000th in broad. 



Hab. Found in numbers from one to four in the intestine of larvae of a large 

 lamellicorn insect, found by my friend Mr. S. Powel in earth mould near Phila- 

 delphia. 



Gregarina, Dnfonr. 



12. Gregarina. Body white, cylindro-fusiform. Superior division present- 

 ing four sides of a hexahedron, subacute. Nuclear body of inferior division 

 transparent, globular or elliptical, containing several coarse granules. 



Length from l-66th in. to Ijlines; head l-400th in. to l-133d in. long by 

 l-285th in. to 1-lllth in. broad. Anterior portion of inferior division l-200th 

 in. to l-86th in. broad ; posterior portion l-666th in. to l-250th in. broad. Lon- 

 gitudinal lines of inferior division more distinct than those of the upper division, 

 l-8000th in. apart. 



Hab. Found in the same insect as the preceding. 



Remark. Since the discovery* of the beautiful, parallel, longitudinal lines of 

 the inferior division of the body of Gregarina, after a careful examination I have 

 come to the conclusien that they also exist upon the superior division. 



Proc. Acad. Nat. Sci., Vol. 4, p. 232. 



