322 J. W. KTHKALDT. 



14. WiLLEY, A..—' Quarterly Journal Micros. Sci.,' 1894, p. 361: "Report 



on Professor Haddon's Collection of Anipliioxus from Torres Straits 

 (cultellum)." 



15. WiLLEY, A.— ' Amphioxus and the Ancestry of the Vertebrates,' 



Macniillan, London, 1894;. 



EXPLANATION OF PLATES 34 & 35, 



Illustrating Miss J. W. Kirkaldy's paper, " A Revision of the 

 Genera and Species of the Branchiostomidse." 



All the figures are drawn of the same absolute size, so as to facilitate a 

 ready comparison of the proportions of each species. A line placed above 

 each pair of figures gives the usual length of adult specimens of the species 

 indicated. With the exception of fig. 1, which is copied from originals drawn 

 from living specimens at Naples by Professor Lankester, the drawings have 

 been made from spirit-preserved specimens. In the views from the ventral 

 surface the prseoral hood has been represented as expanded, as it would 

 probably appear in life, but in the side views (excepting in fig. 1) the actual 

 condition of contraction of the hood seen in the spirit specimens has been 

 more closely followed, and accordingly the side view is not in this region pre- 

 cisely coincident with the ventral view. The ventral mid-surface is repre- 

 sented as distended as it is in life, so that in the profile views it projects 

 below the metapleur. It would be as easy as it is desirable to have drawings 

 from the life of the South Australian Heteropleuron Bassanum and of 

 Amphioxus californiensis. 



Fig. 1. — Ventral and profile views of Amphioxus lanceolatus, Pallas, 

 copied from Lankester (No. 7) with the addition of a tentaculum impar to the 

 oral hood. The animal is represented as seen in life in a basin of water lying 

 on its back (upper figure) or on its side (lower figure), with the prseoral hood 

 and tentacles expanded, the atrial chamber distended, and the atriopore widely 

 open. 



Fig. 2. — Ventral and profile views of Heteropleuron cultellum, 

 Peters. Prseoral hood contracted in the profile view. 



Fig. 3. — Ventral and profile views of Asymmetron Lucayanum, 

 Andrews. 



