226 MESSES. E. HERON-ALLEN AND A. EARL AND ON THE 



notably Stns. 9 and 20, only ferruginous examples. At the other Stns. both types occur, 

 either of them preponderating. The specimens are on the whole irregular in shape, 

 with a tendency to concavity on one side at the expense of the other. At one or two 

 Stns., e. g. No. 19, they were adherent to shell-fragments. Specimens once adherent, 

 but now detached, occur frequently. These adherent individuals are more irregular in 

 growth than the free ones, some being hardly separable from A. gordialis. The bulk 

 of the specimens are noticeably microspheric, but megalospheric specimens referable to 

 Brady's A. tenuis were noticed at Stns. 4, 12, and 19. The megalospheric individuals 

 are, as a rule, very small in size and composed of only one or two convolutions. At 

 Stn. 18 one individual with a semi-chitinous shell was observed. 



87. Amuiodiscus gordialis (Jones & Parker). 



Trochammina squamata gordialis, Jones & Parker, 1860, RFM. p. 304. 

 Ammodiscus gordialis, Brady, 1884, FC. p. 333, pi. xsxviii. figs. 7-9. 



15 Stations. 



Generally distributed, but not abundant, except at Stns. 3, 12, and 19. At Stn. 3 the 

 specimens were small ; at Stn. 19 they were large, often irregular, and some of them 

 nearly spherical, being formed of an intricate convolution of tubes. Both pale and 

 ferruginous individuals at most Stns., but the ferruginous preponderate in numbers. 

 The general form was, as is always the case when the species occurs in any abundance, 

 protean. 



88. AmmodisCUS charoides (Jones & Parker). 



Trochammina squamata charoides, Jones & Parker, I860, RFM. p. 304. 

 Ammodiscus charoides, Brady, 1884, FC. p. 334, pi. xxxviii. figs. 10-16. 



7 Stations. 



Extremely common at Stn. 2, where the species occurs in all stages of development. 

 The specimens are, on the whole, very regular and typical in the arrangement of the 

 primary spiral, but at least one instance was seen at this Stn. in which the secondary 

 spiral was suddenly diverted at a right angle before it had completely enveloped the 

 central initial spiral, thus giving the test the appearance of a globe divided into four 

 sections. A few specimens approached A. gordialis in the irregular disposition of the 

 later convolutions. At Stn. 3 it was very rare and small. At Stn. 10 a single 

 small specimen approaching A. gordialis. At Stn. 19 numerous specimens, many 

 worn as if washed from some distance. At this particular Stn. the final convolutions 

 in the large specimens were irregularly disposed. The comparison to A. gordialis must 

 be considered as referring to the disposition of the chambers only; the constitution of 

 the shell is quite dissimilar, A. gordialis being built up of fine sand-grains with an 

 almost invisible proportion of cement, whereas in A. charoides the test is almost entirely 

 constructed of cement, sand-grains never being observable, even when the convolutions 

 are irregularly disposed. 



