MARYLAM) (i i;ol,(JGICA L SI KVKV 205 



shown, so far a.s tlicsi' otriinvnccs arc coiui'rnt'd, tliat tlic liancocas for- 

 matiuii, to wliitli Tnrhniluhi Imrldiii is liiiiitcd I'arlher north, really ex- 

 ists or ever (li<l c.xi.-t in the area hclow the Eocene strata. The 

 specimens dlitaiiicd, Iihwcmt. arc not unlike the Cretaceous forms. 

 It is ini])or(aii( in this connection that they have never been observed 

 in the inicrvcnin.u- :\ranas(|iian and Shark Uiver formations, both of 

 which !ia\-c rni'nishcd a consiih'raKh' iiiiniluM- of other species. 



The s|»ccinicns \ai-y coii.-iih'ralily in size, althou^li tin' larger forms 

 predominate. 'I'hc hii'i^cst s|»ccinn'ns ai-e Ironi In to SO mm. in height 

 and 10 to 50 mm. in width. 



Occurrence. — Aql'ia l'\)i{:\rATi()X. o miles west of Leeland, Severn 

 I\iver opposite Annapolis, 



Collect ioii!^. — j\laryland Geological Survey. ]\raryland Academy of 

 Sciences. 



Class BRYOZOA. 



Order CYCLOSTOMATA. 



Family TUBULIPORIDAE. 



Genus DISCOSPARSA d'Orbigny. 

 DiSCOSPAESA YAKIAXS n. Sp. 



Plate LIX, Fig. 3. 



Description. — Zoariiim forming subcircular (young) or irregular, un- 

 dulating expansions, 2 to 10 mm. wide, parasitically attached, or more 

 or less free and epithecated beneath. In young colonies which are often 

 spread over the original layer, the zooeeial apertures, which are enclosed 

 by moderately elevated, ring-like peristomes, are, sometimes uniserially, 

 but never very regularly, arranged in a radiate manner about the small, 

 depressed and smooth central space. In older examples, there are sev- 

 eral of these maculae, but the radial arrangement of the zooecia about 

 them, is generally obscure. The ooecia immediately surrounding the 

 maculae are often of larger size and more oblique than those covering 

 the intermediate spaces where they are quite direct, but in worn ex- 

 amples very little difference in size is noticeable. The interzooecial 



