LITUOLIDAE 83 



Genus Placopsilina, d'Orbigny, 1850 



123. Placopsilina cenomana, d'Orbigny (F 98). 

 Five stations: 45, 136; WS 51, 61, 154. 



The best stations were WS 51 and 61, where many specimens of the small neat form 

 found in British seas were observed encrusting stones. Otherwise the specimens are few 

 and rather feeble. At St. 45 two unattached specimens were found, probably dislodged 

 from their original host. 



Sub-family TROCHAMMININAE 



Genus Ammolagena, Eimer and Fickert, 1899 



124. Ammolagena clavata (Jones and Parker) (F 99). 

 Three stations: WS 334, 521, 522. 



Several good specimens at each station. 



Genus Tolypammina, Rhumbler, 1895 



125. Tolypammina vagans (Brady) (F 100). 



Sixteen stations: 17, 27, 126, 136, 144, 145, 14S; WS 31, 33, 51, 61, 154, 344, 353, 363, 365. 



Common at WS 51 and 61, frequent at St. 17 and WS 33, but rare elsewhere. All the 

 specimens are rather small, the best being at Sts. 27, 144 and WS 33. 



Genus Ammodiscus, Reuss, 1861 



126. Ammodiscus incertus (d'Orbigny) (F loi). 



Eighteen stations: 14, 20, 45, 123, 131, 140, 144, 148; WS 27, 33, 40, 42, 113, 154, 348, 349, 353, 

 426. 



Widely distributed and often fairly common, the best stations being St. 144 and WS 1 54. 

 The specimens are larger and better developed with more ferruginous cement than in 

 the Falkland area, but present the same variations as we commented on in that Report. 

 Flat and evenly coiled specimens are very rare, the best being at Sts. 45, 148, WS 33, 

 42 and 353. At nearly all the other stations the specimens are more or less irregular in 

 coiling and pass imperceptibly into Glomospira gordialis. None of the specimens are 

 very large, seldom exceeding 0-3 mm. in diameter, and they are all microspheric. At 

 WS 27 a sessile specimen was seen. All the specimens have a matt surface, i.e. there is 

 never sufficient cement to envelop the minute sand grains. Their colour varies from 

 white through grey to ferruginous brown. 



Genus Glomospira, Rzehak, 1885 



127. Glomospira gordialis (Jones and Parker) (F 102). 



Twenty-nine stations: 15, 17, 27, 30, 42, 45, 123, 126, 140, 144, 149; WS 25, 27, 31, 33, 40, 41, 

 42, 43, 51, 61, 63, 63-4, 113, 349, 365, 426, 428; MS 14. 



