. Bulletin. Natural history; Natuurlijke historie. Figure 22. 1. Bolbolenellus groenlandicns (Poulsen), locality is the same as Figure , latex cast of the holotype, MGUH 2233, 2. Bolbolenellus altifrontatus (Fritz), locality is the same as Figure , GSC 27435, the holotype, gesting that what he called Bristolia groenlandica might be related either to Fremontella or to some other new genus. Poulsen (1964) marshaled additional character evidence to sug- gest a close relationship between Bristolia bristolensis (Resser) and Bolbolenellus groen- landicns. In particular, he argued
. Bulletin. Natural history; Natuurlijke historie. Figure 22. 1. Bolbolenellus groenlandicns (Poulsen), locality is the same as Figure , latex cast of the holotype, MGUH 2233, 2. Bolbolenellus altifrontatus (Fritz), locality is the same as Figure , GSC 27435, the holotype, gesting that what he called Bristolia groenlandica might be related either to Fremontella or to some other new genus. Poulsen (1964) marshaled additional character evidence to sug- gest a close relationship between Bristolia bristolensis (Resser) and Bolbolenellus groen- landicns. In particular, he argued that these species have a similar general outline of the cephalon, convexity of the border and position of the genal spines, though he admitted that they did differ in other respects. What Poulsen (1927) referred to as Olenellus ken- tensis is very poorly preserved, lacking the anterior and lateral cephalic borders, and is thus difficult to comment on. However, it appears very similar to, if not identical with, Bolbolenellus groenlandicns. Poulsen (1964) claimed that Olenellus kentensis and B. groen- landicns differed in the condition of L4, which he claimed attained its maximum width at the midline of L4, whereas B. groeidandicus attained its maximal width at the anterior margin of L4; and what he called the transglabellar furrow (S3), which he claimed was shallower in O. kentensis than in B. groenlandicns. Since the anterior margin of L4 and the cephalon in O. kentensis are not preserved, it is very difficult to ascertain whether it truly differs from B. groenlandicns in the condition of L4 described above. S3 appears to be equally incised in both taxa. Because O. kentensis is so poorly preserved and known from such limited material, and because it seems to show no significant differences from B. groenlandicns, at this time it is treated as conspecific with B. groenlandicns until additional material can be recovered. When considered in detail, Bolbolenellus groenlandicns has
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