188 MOLLUSCA. 
8. Ortalichus maclure, sp. n. (Tab. XI. figg. 1, 2, 3.) 
Testa ovato-conica, solida, subtiliter spiratim striatula, ad suturam plicatula, flavescens, strigis latis subrectis 
nigro-fuscis picta; anfr. 64, paullum convexi, superiores 3 flavidi, non strigati, apice sepius fusco, ultimus 
regulariter ovatus; apertura dimidia longitudine brevior, peristomate latiuscule nigro-fusco, crassiusculo, 
columella alba, callo intensive castaneo-fusco. Long. 52, diam. 29, apert. 27 millim. 
a. Anfractu ultimo equaliter strigato, apice pallido vel minute fusco. (Fig. 3.) 
b, Anfractu ultimo strigis confluentibus, antrorsum subsequaliter fulvo, varicibus iteratis, fasciis spiralibus 
2 ab anfractu quarto usque in partem anfr. ultimi continuatis, apice late fusco-nigro, columella anguste 
albescente. (Fig. 2.) 
c. Albinus, strigis et callo perpallide fulvis; apice et peristomate albis. (Fig. 1.) 
Hab. N.W. Nicaragua: Cacao, in the Bay of Fonseca, on trees of the yellow-wood, 
Maclura aurantiaca, fam. Moree (Capt. Joh. Schéffer). 
Owing to the kindness of Fr. Borcherding, Vegesack, Bremen, I have before me 
twenty-two specimens collected at the same locality, which cannot be separated 
specifically one from the other. The ground-colour is a very pale yellow, in worn 
specimens white ; the streaks are broad, dark blackish-brown, the interstices between 
them mostly about equal in width to the streaks themselves; in the upper whorls, 
however, the interstices are often even broader, and in this respect young, somewhat 
bleached, specimens very much resemble O. doucardi; in some adult specimens, on 
the contrary, the streaks are narrower and more numerous in the last whorl, these 
examples approaching O. zoniferus. In most specimens the streaks are not forked at 
their upper end; in some, however, a few streaks are forked, but in none is the 
forking so constant and conspicuous as it is in O. princeps. In a few examples one, 
two, or three narrow dark spiral bands are present on the fourth, or on the fourth and 
fifth whorls, the lowest of them in the suture. In some specimens the apex is of the 
same pale yellow as the three upper whorls; in others it is to a very small extent 
dark brown ; in others, again, nearly the whole first whorl is dark. The coloration of 
the tip does not coincide with the more or less numerous streaks on the last whorl, 
but in the specimens with spiral bands the dark colour of the tip is rather more 
extended. The sculpture usually consists of spiral striz only ; but in several specimens 
numerous malleated impressions are also visible, sometimes in rows descending towards 
the aperture. The dimensions given above are taken from a most typical example of 
middle size; the largest specimen measures 58, 30, and 29 millim., but it is one of 
those which approach 0. zoniferus. The var. 6 shows a prevalent dark coloration 
of the tip, the last whorl, and the aperture, together with a spiral band which is 
constantly present in the first half of the last whorl. The var.c may be termed 
an albino specimen, the brown colour being very pale in the streaks and in the 
callus of the aperture, and wanting altogether at the tip and on the external edge 
of the aperture. 
