200 Herbert L. Haivhins — On Lanieria of Duncan. 



specific name of lanieri, and, with hesitation, included it in tlie 

 genus Echinoconus, as the Galerites of previous authors was then 

 called. As Cotteau himself remarked, the name of the fossil must 

 be ascribed to him, as d'Orbigny's description was unpublished. 



In 1897 Egozcue y Cia gave a Spanish translation of Cotteau's 

 description (Eol. Com. Map. geol., Madrid, '^o. 22, p. 9), giving 

 a reproduction of the figures, and adding further measurements and 

 a new locality for the species. 



Duncan, in the Revision (1889), p. 168, very properly removed 

 the species from Eclmioconus and diagnosed a new genus, Lanieria, 

 for its reception. It was, and is still, the sole species of the genus. 



Cotteau, in the original description of the species, made use of 

 several specimens (not all of which, unfortunately, belonged to the 

 same genus), and gave figures of two. One of the figured specimens 

 (Cotteau, loc. cit., pi. i, fig. 11), was in the Dewalque Collection, 

 and is now in the British Museum of Natural History. In view 

 of the confusion of forms described hereafter I hereby select this 

 specimen (E. 4570) as the holotype. 



There are five other specimens from the same locality and collection 

 in the Museum. All of these were labelled '^ Echinoconus I/mieri^', 

 and among them all the main features of Cotteau's description are 

 included. However, only two of tliem (besides the type) belong to 

 the genus Lanieria, tlie others being certainly referable to 6te«- 

 holectypus. It becomes necessary, therefore, to distinguish between 

 the two types represented, and to free the diagnosis of Lanieria 

 from the characters of Ccenholectypus Avith which it is encumbered. 

 At the same time some further details of the structure of Lanieria 

 can be given. The peculiar features of the genus raise a question 

 of phylogenetic and morphological interest. I am preparing a more 

 detailed study of this question as it affects the Irregular Echinoids, 

 but the lines of argument are briefly put forward at the close of 

 this paper. 



2. Eedesceiption of Lanieria laniebi (Cotteau), Duncan. 



The three specimens of this species in the British Museum are 

 registered as E. 4570 (the lectotype), E. 4571, and E. 4572. In the 

 following description tlie first part is concerned solelj^ with the type, 

 additional features seen in the other specimens being added later. AH 

 the specimens are from the (?) Uppermost Cretaceous, Cienfuegos, Cuba. 



E. 4570. Diameter 15-9, height 14-2 mm. at ambitus. Ambulacra 3, 

 interambulacra 7 mm. wide. Diameter of peristome 4-8, of periproct 

 3-9 and 2-2 mm.; distance between peristome and periproct TSmm. 

 Diameter of apical system O'S mm. 



The ambitus is practically circular, and is situated about halfway 

 between the apex and the peristome. The form of the test is almost 

 globular, there being no appreciable flattening of tlie adoral surface. 

 In fact, the specimen rests on the actual margin of the peristome, and 

 on that alone, when placed with the adoral surface downwards. The 

 test is very thin. 



The apical system is central, approximately circular in outline, and 

 projects slightly above the surrounding coronal plates. The sutures 



