314 Miscellaneous. 



stinctly says, the skulls contained fragments of the latter and none of 

 the former ; upon this point the Archdeacon also expressly states, 

 " they were both found lying close together." If therefore the 

 above skull eventually proves to be that of a bear, the period of its 

 existence is decided to have been coseval with that of the Megaceros ! 

 Believe me, my dear Sir, yours very truly, 



Henry Denny, A.L.S, 



On some new genera and species of Entozoa. By Dr. Leidy. 



1. Ascaris cylindrica. Body nearly cylindrical throughout, an- 

 teriorly moderately attenuated; tail curved, 1 -214th of an inch in 

 length from the anus ; oesophagus elongated, gibbous in the middle, 

 with the oesophageal bulb and pharynx 1-1 00th of an inch in length ; 

 oesophageal bulb pyriform, l-75th of an inch in diameter ; ventricle 

 or intestine somewhat tortuous, cylindrical, dilated at both extremi- 

 ties ; rectum pyriform ; female generative aperture about half-way 

 between the mouth and tail. Whole length 4-5th of a line, breadth 

 1-1 2th of aline. 



Hab. Small intestine of Helix alternata. 



Remarks. — I found the female only of this species in fifteen out of 

 forty specimens of Helix alternata, in numbers of from one to three. 

 The ovaries in all were distended with ova, the latter measuring 1 -430th 

 of an inch in length by 1-5 76th in breadth. 



2. Ascaris infecta. Female. — Subcylindrical, gradually diminishing 

 towards the extremities, white, with a brown streak down the lower 

 two-thirds of the middle line ; anteriorly obtusely rounded ; tail 

 slightly curved, l-80th of an inch long from the anus. The three 

 papillae of the mouth projecting ; oesophagus strongly muscular, thick, 

 oblong, pyriform, l-80th of an inch long, greatest breadth 1-1 75th 

 of an inch ; oesophageal bulb cordiform, 1-1 66th of an inch long by 

 1-1 66th of an inch broad ; ventricle slightly dilated at commencement, 

 contracted posteriorly ; generative orifice projecting, just below the 

 middle of the body ; vagina furnished with a large ovate seminal 

 receptacle. 



Male. — Dilated at both extremities ; tail thick, 1-1 74th of an inch 

 long, furnished upon its inner aspect with two minute tubercles. 

 Above the anus are two rows, each of four tubercles, connected by 

 delicate folds of integument. (Esophagus 1-1 11th of an inch long 

 by 1 -260th of an inch broad; oesophageal bulb depressed cordiform, 

 1-2 14th of an inch long by 1 -250th of an inch broad. Penis formed 

 of two curved spicules, measuring in length, in a straight line, l-78th 

 of an inch. 



Length of adult female 3 to 4-i- lines ; breadth at origin of ventri- 

 culus 1-1 23rd of an inch; middle of body l-83rd to l-60th of an 

 inch ; just above anus l-144th of an inch. Ova 1-3 19th of an inch 

 long by l-428th inch broad. 



Length of male 2 lines ; breadth at origin of ventriculus 1-1 76th of 

 an inch ; middle of body 1-21 1th of an inch ; just above anus l-202nd 

 of an inch. Spermatophori oval, 1-1391 inch long by 1-1 666th 

 inch broad, with spermatozoa 1-3 750th inch long by 1-1 0,000th 

 inch broad. 



