26 Dr. P. H. Carpenter on the 



than five, and that Rhizocrinus is the only genus which has so 

 few ? Are they not aware that forty years ago Muller not only 

 described but also figured a large number of water-pores at 

 the sides of the ambulacra in Pentacrinus *, and that I noted 

 the presence of several pores in Bathycrinus and Hyocrinus 

 in 1882 t ? The same character was described as occurring in 

 Holopus and Metacrinus in the ' Challenger ' Report ; and, as 

 a matter of fact, Rhizocrinus is the only Stalked Crinoid which 

 at all resembles the Comatula larva, and this in having not 

 one, but five water-pores ! 



Messrs. Vogt and Yung have illustrated their ' Monograph ' 

 by a number of woodcuts which admirably represent the 

 structure of Antedon rosacea ; and I am glad to be able to 

 speak of these figures in terms of unqualified praise. It is 

 unfortunate, however, that their great excellence should be 

 marred by errors and omissions in the lettering and in the 

 explanations of the figures which are given at the bottom of 

 each page. Thus, for example, in the explanation of fig. 266 

 on p. 525 q and q^ are transposed, while P is printed li} ; in 

 like manner in fig. 267, on the following page, the i indicating 

 the intestine is printed as the v marking an ambulacral groove ; 

 p^, which indicates the wall of 2^ (cavity buccale), is marked 

 " couche fibreuse de la parol intestinale ; " while an accidental 

 rent, caused by the tearing away of the extensor fibres 

 between the axillary radial and the first brachial, is marked 

 ■with a sign which may be either a^ or d} badly printed ; a^, 

 however, stands for the primary radial, and d^ is not explained 

 at all ; neither are t and e^. 



Figure 268, on page 527, is described as a " Coupe verti- 

 cale passant par I'axe et la ligne ant^ro-posterieure, designee 

 par les orifices buccal et anal." In reality, however, it is 

 not a truly vertical section at all. If it we]'e so its dorsal 

 portion would pass through the central capsule and show its 

 internal chambers, with the origins of the cirrus-vessels and 

 the axial cords of the first radials, just as is seen in fig. 267, 

 on the previous page. This last represents a (nearly) vertical 

 section, i. e. one which cuts the median plane in the calyx and 

 is just outside the edge of the peristome on the ventral side ; 

 and it is sufticiently near to the median vertical plane to be 

 fairly described as such without exaggeration. But the 

 section represented in fig. 268 is very considerably oblique, 

 for its dorsal portion passes through the extreme outer edge 



* " Ueber den Bau des Pentacrinus capiit-medusce" Abhandl. d. k. Akad. 

 d. "Wiss. Berlin, 1843, p. 49, Taf. ii. fig. 14. 



t " Notes on Ecbinoderm Morphology. — No. V.," Quart Journ. Micr. 

 Sci. new ser. 1882, vol. xxii. p. 383. 



