OF CONCHOLOGY. 



63 



that his own genus Gwynia, and all the Megatliyrince have it 

 non-truncated in the adult condition, when perfect. The inter- 

 nal plate closing the posterior part of the foramen, is also more 

 or less developed in all the young Terebratulce that I have ex- 

 amined. 



If the form in question be adult, it represents the imma- 

 ture stage of Terebratulina, and while it may, in such a case, 

 have a subgeneric value, I think that this requires further 

 confirmation. That it really belongs with Terebratulina, rather 

 than Terebratula, may be inferred from the peculiar branching 

 tubulation, first pointed out by Prof. King as occurring in Tere- 

 bratulina caput serpentis. (Tr. Roy. Ir. Acad, xxiv, part xi, 

 1869.) 



Prof. King himself, in a note, says that he has some grounds 

 for suspecting that there is a closer relation between Terebratu- 

 lina and Agulhasia than would at first sight be admitted. In 

 this I agree entirely, and had the learned Professor had as good 

 an opportunity for examining the young stages of the recent 

 species as he has had for the adult fossil forms, I believe he 

 would hardly have raised this one to the rank of a genus. 



WALDHEIxMIA. 



Page 110. W. cranium, Mull. This species has not been 

 found in Japan, although so reported ; the shells found and 

 referred to this species do not belong to it. The "suture," or 

 breaking point, described by Messrs. Jeffreys and Carpenter as 

 existing in the loop of W. cranium, is due to the deposition of 

 the laminae of the loop in layers parallel with the longer axis 

 of the valves, which makes the loop weaker at the point of reflec- 

 tion than elsewhere. 



To the localities for W. G-r ay i may be added Sta. Cruz, Id., 

 Purissima and Lobitas, California; Newcomb and Stearns. 



W. RapJiaelis, Dall (p. Ill), is very much larger than either 

 floridana or septigera, from which it appears to differ in anato- 

 mical characters as well, and may be considered as a well cha- 

 racterized species. 



It has been further compared with other allied forms, and 

 proves to be quite distinct from W. septigera, though belonging 

 with it and W. floridana, in a peculiar group of the genus. 



Waldheimia septigera, Loven, p. 112, (Bull. Mus. C. Zool. 

 iii, pi. 1, fig. 4, and pi. ii, fig. 9) is quite distinct from floridana 

 and from T. septata, Phil., which proves to be a Terebratella. 

 It has not been found in Japan, and g that locality should be 

 erased. 



