MOXOO HAITI'S. 421 



Monograptus pandus (Lapworth). Plate XLII, figs. 3a — d. 



1877. Monograptus lobiferm var. pandus, Lapworth, G-rapt. Co. Down, Proc. Belfast Nat. Field 



Club, p. 129, pi. vi, figs. 3 a — c. 

 1897. Monograptus densus, Peruer, G-rapt. de Boheme, pt. iii, p. 22, pi. xi, figs. 12, 13. 



Polypary several cm. in length, approximately straight; fairly robust even at 

 the proximal end and widening steadily till a maximum breadth of 2'5 mm. 

 is attained. Thecoa nine to ten in 10 mm., of the general type of M. priodoii, 

 but shorter, and set so that the hooks, involving one-third only of the 

 thecas, are often nearly in contact, and only occupy one-fifth of the total 

 breadth of the polypary. 

 Description. — Mohog. pandus is often of considerable size, and in some of the 

 longer specimens its breadth seems slightly to exceed that given for the Bohemian 



form M. densus, with which, however, it agrees so 



Fig. 283. — Monoqrautus pandus n i • j_i <• n j_i - j_ • ±- n 



(Lapworth). closely in other particulars that it is practically 



certain that the two are specifically identical. 



The most prominent character of M. pandus is 



y,\ undoubtedly the presence of the short thecae set at 



so high an angle that the relatively short hooks are 



>j$\ nearly in contact at their extremities. This feature 



. •£} is most marked in the distal thecas, those of the 



proximal end approximating more closely to the 



Distal fragment. Enlargement of part theC93 of M. Marri ', indeed the whole proximal end 

 of Pi. XLII, fig. 3 b. t 



approaches that of M. Marri in general characters, 

 but is stiffer and slightly more robust, while the sicula has a greater length 

 (17 mm.). 



Affinities. — Monog. pandus is a form which, in many respects, is intermediate 

 between M. priodoii and M. Marri. From M. priodon it differs chiefly in the 

 relatively shorter and less conspicuous hook, and from M. Marri in these characters 

 and also in the fact that it is always more robust. 



Horizon and Localities. — Gala-Tarannon Beds (zone of M. turriculatus to zone 

 of M. griestoniensis). 



Lake District : Swindale; Browgill ; Rawthey Bridge, Sedbergh. N. Wales: 

 Forge Corner, Conway. Ireland : Tieveshilly, Co. Down. 



Associates, etc. — Monog. pandus appears to be confined to rocks of Gala- 

 Tarannon age. It occurs in the zone of M. turriculatus associated with the zone 

 fossil, M. nodifer, M. runcinatus, M. dextrorsus, etc.; in the zone of M. crispus with 

 M. crispus, M. exiguus, M. discus and M. Marri, and in the zone of M. griestoniensis 

 with M. discus and the zone fossil. 



Collections. — Sedgwick Museum, Lapworth, and the Authors. 



