400 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Peristome complete proximally; avicularium usually present; 



frontal not tuberculate 6 



6. Peristome high, tubular; avicularian rostrum usually much ele- 



vated, in the absence of an avicularium the peristome is 



circular maccullochae 



Peristome not high and tubular 7 



7. Avicularium not enclosed by peristome, its chamber elongate, 



mandible elliptical spathulifera 



Avicularium enclosed in the peristomial sinus fold 8 



8. Avicularian rostrum low, chamber small and short; frontal little 



ventricose landsborovi 



Avicularian rostrum higher, projecting over lyrula ; ovicell with a 

 transverse groove arctica 



Smittina landsborovi (Johnston), 1847 

 Plate 47, figs. 1-2 



Lepralia landsborovi Johnston, 1847 :310. 

 Lepralia landsborovii. Busk, 1854:66. 

 Escharella landsborovii, Smitt, 1867:92. 

 Smittia landsborovii, Hincks, 1880:341. 

 Smittia landsborovii, Robertson, 1908 :305. 

 Smittia landsborovii, O'Donoghue, 1923:42. 

 Smittina landsborovii, O'Donoghue, 1926:66. 



Just what the typical form of landsborovii may be appears to be in 

 doubt. Johnston's description is brief and his figure (Plate 54, fig. 9) is 

 inadequate, and we can only be certain that the frontal is smooth and 

 thickly perforated, that the secondary aperture is pyriform and that there 

 is an elongate, slender, pointed lyrula. Busk added the suboral avicularium 

 and figures it (Plate 86, fig. 1 ) as small rounded and enclosed in the 

 proximal fold of the peristome and the lyrula is broad. Smitt certainly 

 confused two other species with it and only his figure 63 (Plate 24) 

 shows the characters indicated by Johnston and Busk. Alder (1864:105) 

 gives a more complete description and his figure (Plate 4, figs. 1-3) is 

 evidently of the same species as those of Johnston and Busk. Hincks 

 confused another species with landsborovii, as his figures (Plate 48, 

 figs. 7, 8) with imperforate frontal certainly do not belong to this species. 

 How many other errors have been made in recording landsborovii from 

 all parts of the world it is impossible to judge. The form corresponding 

 to the figures of Johnston, Busk and Alder is here described. 



