1884.] NATURAL SCIENCES OF PHILADELPHIA. 51 



but nevertheless appears to gradate between the extremes. The 

 specimens recently examined were the smallest observed ; and in 

 the closed condition measured 0'32 to 0"35 mm. long by 0*3 to 

 0*32 mm. broad. Former ones described were from 0'35 to 0*6 

 mm. long by 0*28 to 0"5 mm. broad. For Ciipelopagus, Forbes 

 gives 0*64 mm. long by 0*56 broad ; and for Apsilus lentiformis, 

 Meczinchow gives 0*8 mm. long by 0*7 mm. broad. 



Miss FouLKE enquired whether Dr. Leidy had noticed the 

 secondary sacculated stomach. 



The President answered in the affirmative, and stated that the 

 secondary stomach was present in all the forms. 



Miss Foulke replied that none of the forms previously dis- 

 covered had been either fisured or described as possessing this 

 organ; that Dr. Leidy 's description coincided exactly with that 

 of Apsilus bipera, as given by the speaker ; and that, in any case, 

 should this form, though differing in every particular save the 

 structure of the mastax, prove to be identical with the Dictyo- 

 phora vorax of 1857, still the differences between Apsilus hipera^ 

 the Apsilus lentiformis of Meczinchow and the Gupelopagus of 

 Forbes — viz. : the difference in shape, the presence or absence of 

 antennae, of the secondary stomach, and of the ciliation of the 

 cup — remain the same, and must separate the forms until proof 

 of their identity can be given. 



A New Species of Trachelius. — Prof. H. Carvill Lewis, on 

 behalf of Miss S. Q. Foulke, made the following communication : 



Having poured some Schuylkill water, freshly drawn from the 

 spigot, into a tube, a white speck was noticed swimming freely 

 about. On being placed in a live-box, and examined with a power 

 of thirty-eight diameters, this speck proved to be a member of the 

 family Trachelidae, of Ehrciberg. 



The family Trachelid^e includes three genera: — Trachelius, 

 Amphileptus^ and Loxophyllum. 



The genus Trachelius consists of but one species, Trachelius 

 ovum (Ehr.), from which the form found in the Schuylkill water 

 differs considerably in shape. 



Trachelius ovum was described by Ehrenberg as possessing a 

 complex and profusely ramified oesophagus canal, and this opinion 

 was endorsed by Lieberkuhn, also b}' Claparede and Lachmann ; 

 but W. Saville Kent disputed the point, and believes the appear- 

 ance of the above structure to be given by the extreme vacuola- 

 tion of the protoplasm, which would lend a branched intestine-like 

 appearance to the intervening granular sarcode. The observations 

 of the writer, in this respect, entirely coincide with those of Mr. 

 Kent. 



Ehrenberg also placed in the genus Trachelius two other 

 species, A'iz., T. tricophora and T. dendropholus, but these forms, 

 being true flagellates, have been relegated to the genus Astasia. 



