SYSTEMATIC DESCRIPTIONS— SPATANGINA. 85 



nearly horizontal. The posterior pair I and V are a little longer and form 

 an acute angle [of about 48°] posteriorly. Tubercles are abundant, fine, 

 crowded, and homogeneous below the ambitus; larger and more widely 

 spaced dorsally at the approach to the apical disk and completely cir- 

 cumscribed by the peripetalous fasciole. Ventrally, around the peristome 

 the tubercles are relatively larger and less numerous; they form on the 

 plastron very regular longitudinal and radiating series. The peristome is 

 semicircular, labiate, excentric anteriorly. Periproct oval, opening at the 

 summit of the posterior face. The apical disk is small, with 4 genital pores; 

 the anterior pores 2 and 3 are nearer than the posterior pores 1 and 4.' 

 Peripetalous fasciole very sinuous, following the contour of the ambulacrai 

 petals ; subanal fasciole annular. 



Height 35 mm., length 61 mm., width 51 mm.; the width would 

 measure a little more but for lateral compression. This species is near 

 to M. antillarum, but differs from it greatly in size. M. clevei is also 

 higher, more swollen, the anterior furrow nearly wanting at the sum- 

 mit, and the apical disk relatively farther posteriorly than it is in 

 antillarum. The apical disk is 24 mm. from the anterior border. 



There is only one specimen in Washington, which is doubtless the 

 original of Cotteau's figures. He says that it is very rare and does not 

 mention other material than the Cleve collection in his 1875 memoir, but 

 does mention other specimens of the species in his Spanish report, 1897, 

 where he says the species occurs in Cuba. 



Oligocene, Anguilla formation, island of Anguilla, Guppy collection 

 ex Cleve, 1 specimen, holotype, U. S. Nat. Mus. No. 115410. Cotteau 

 records the species from the "Miocene" of Cuba and says an internal mold 

 is in the collection of the Comisi6n del Mapa Geol6gico de Espana, 

 Madrid. 



Macropneustes antillarum (Cotteau). 

 (Plate IS, Figure 1.) 



Peripneusles antillarum Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, pp. 7, 

 39, plate 7, figs. 1 to 3; 1881, Ann. Soc. Geol. Belgique, vol. 9, p. 46. 



Macropneustes antillarum Guppy, 1882, Scientific Assoc. Trinidad, Proa, part 12, p. 198. 



Macropneustes antillarum Cotteau [by clerical error Macropneustes antillanus on his page 95], 

 1897, Bol. Com. Mapa Geol. Espafia, vol. 22, p. 95, plate 29, figs. 1 to 3. 



The following is an extract from the original description of this species: 



Species of very large size, elongate, subcordif orm ; expanded anteriorly, 

 a little narrowed posteriorly. Upper face high and elevated anteriorly, 

 strongly inclined posteriorly, having its greatest height a little anterior 

 to the apical disk. Posterior face short, truncate, and slightly reentrant. 

 Lower face nearly flat, appearing to be a little elevated in the posterior 

 interambulacrum, depressed in front of the peristome. Apical disk very 

 excentric anteriorly [only about 32 mm. from the border]. The anterior 

 furrow beginning near the apical disk is narrow and short at its upper 

 portion, wide- and deep in approaching the ambitus, which it strongly 

 indents. Anterior ambulacrum III with small pores widely spaced. The 

 paired ambulacra with narrow, elongate petals are quite deeply excavated. 

 The anterior pair II and IV are very divergent, nearly horizontal; the 

 posterior pair I and V are a little longer and form an acute angle posteriorly. 



